11613657531 has 12 divisors (see below), whose sum is σ = 18013020072. Its totient is φ = 6636375648.

The previous prime is 11613657509. The next prime is 11613657533. The reversal of 11613657531 is 13575631611.

It is a happy number.

It is not a de Polignac number, because 11613657531 - 2⁷ = 11613657403 is a prime.

It is a super-2 number, since 2×11613657531² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11613657531.

It is not an unprimeable number, because it can be changed into a prime (11613657533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39502090 + ... + 39502383.

It is an arithmetic number, because the mean of its divisors is an integer number (1501085006).

Almost surely, 2^11613657531 is an apocalyptic number.

11613657531 is a deficient number, since it is larger than the sum of its proper divisors (6399362541).

11613657531 is an equidigital number, since it uses as much as digits as its factorization.

11613657531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79004490 (or 79004483 counting only the distinct ones).

The product of its digits is 56700, while the sum is 39.

The spelling of 11613657531 in words is "eleven billion, six hundred thirteen million, six hundred fifty-seven thousand, five hundred thirty-one".