11697521531 has 2 divisors, whose sum is σ = 11697521532. Its totient is φ = 11697521530.

The previous prime is 11697521503. The next prime is 11697521579. The reversal of 11697521531 is 13512579611.

It is a weak prime.

It is an emirp because it is prime and its reverse (13512579611) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11697521531 is a prime.

It is a super-2 number, since 2×11697521531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11697523531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5848760765 + 5848760766.

It is an arithmetic number, because the mean of its divisors is an integer number (5848760766).

Almost surely, 2^11697521531 is an apocalyptic number.

11697521531 is a deficient number, since it is larger than the sum of its proper divisors (1).

11697521531 is an equidigital number, since it uses as much as digits as its factorization.

11697521531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 41.

The spelling of 11697521531 in words is "eleven billion, six hundred ninety-seven million, five hundred twenty-one thousand, five hundred thirty-one".