Search a number
-
+
31001111101 = 41756124661
BaseRepresentation
bin11100110111110011…
…110110101000111101
32222000112001121122001
4130313303312220331
51001442241023401
622124113222301
72145144045052
oct346763665075
988015047561
1031001111101
1112169356684
126012261991
132c00900c2c
1417013a5029
15c16979601
hex737cf6a3d

31001111101 has 4 divisors (see below), whose sum is σ = 31757235804. Its totient is φ = 30244986400.

The previous prime is 31001111069. The next prime is 31001111111. The reversal of 31001111101 is 10111110013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15394605625 + 15606505476 = 124075^2 + 124926^2 .

It is a cyclic number.

It is not a de Polignac number, because 31001111101 - 25 = 31001111069 is a prime.

It is a super-2 number, since 2×310011111012 (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001111111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378062290 + ... + 378062371.

It is an arithmetic number, because the mean of its divisors is an integer number (7939308951).

Almost surely, 231001111101 is an apocalyptic number.

It is an amenable number.

31001111101 is a deficient number, since it is larger than the sum of its proper divisors (756124703).

31001111101 is an equidigital number, since it uses as much as digits as its factorization.

31001111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756124702.

The product of its (nonzero) digits is 3, while the sum is 10.

Adding to 31001111101 its reverse (10111110013), we get a palindrome (41112221114).

The spelling of 31001111101 in words is "thirty-one billion, one million, one hundred eleven thousand, one hundred one".

Divisors: 1 41 756124661 31001111101