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9998200081 = 999912
BaseRepresentation
bin10010100111111000…
…00110110100010001
3221210210101012002201
421103330012310101
5130434014400311
64332040043201
7502523204242
oct112374066421
927723335081
109998200081
1142707a5781
121b30463501
13c3450a12c
146abc14cc9
153d7b549c1
hex253f06d11

9998200081 has 3 divisors (see below), whose sum is σ = 9998300073. Its totient is φ = 9998100090.

The previous prime is 9998200061. The next prime is 9998200087. The reversal of 9998200081 is 1800028999.

It is a happy number.

The square root of 9998200081 is 99991.

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

9998200081 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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: 1800028999 = 3541950821.

It is not a de Polignac number, because 9998200081 - 217 = 9998069009 is a prime.

It is a super-2 number, since 2×99982000812 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9998200087) 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, 49996 + ... + 149986.

It is an arithmetic number, because the mean of its divisors is an integer number (3332766691).

Almost surely, 29998200081 is an apocalyptic number.

9998200081 is the 99991-st square number.

9998200081 is the 49996-th centered octagonal number.

It is an amenable number.

9998200081 is a deficient number, since it is larger than the sum of its proper divisors (99992).

9998200081 is an frugal number, since it uses more digits than its factorization.

9998200081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199982 (or 99991 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 46.

The cubic root of 9998200081 is about 2154.3054220114.

The spelling of 9998200081 in words is "nine billion, nine hundred ninety-eight million, two hundred thousand, eighty-one".

Divisors: 1 99991 9998200081