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991301000881 = 9956412
BaseRepresentation
bin11100110110011100010…
…01001101111010110001
310111202201110201111001111
432123032021031322301
5112220141024012011
62035221500433321
7131422235323402
oct16331611157261
93452643644044
10991301000881
11352454632124
12140154848841
137262cca6a99
1435d9cdc59a9
151abbcbe5121
hexe6ce24deb1

991301000881 has 3 divisors (see below), whose sum is σ = 991301996523. Its totient is φ = 991300005240.

The previous prime is 991301000869. The next prime is 991301000887. The reversal of 991301000881 is 188000103199.

It is a happy number.

The square root of 991301000881 is 995641.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 188000103199 = 1371372263527.

It can be written as a sum of positive squares in only one way, i.e., 718722481 + 990582278400 = 26809^2 + 995280^2 .

It is not a de Polignac number, because 991301000881 - 25 = 991301000849 is a prime.

It is a super-2 number, since 2×9913010008812 (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991301000887) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 497821 + ... + 1493461.

It is an arithmetic number, because the mean of its divisors is an integer number (330433998841).

Almost surely, 2991301000881 is an apocalyptic number.

991301000881 is the 995641-st square number.

991301000881 is the 497821-st centered octagonal number.

It is an amenable number.

991301000881 is a deficient number, since it is larger than the sum of its proper divisors (995642).

991301000881 is an frugal number, since it uses more digits than its factorization.

991301000881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991282 (or 995641 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 40.

It can be divided in two parts, 99130 and 1000881, that added together give a palindrome (1100011).

The spelling of 991301000881 in words is "nine hundred ninety-one billion, three hundred one million, eight hundred eighty-one", and thus it is an aban number.

Divisors: 1 995641 991301000881