11165857931 has 2 divisors, whose sum is σ = 11165857932. Its totient is φ = 11165857930.

The previous prime is 11165857903. The next prime is 11165857933. The reversal of 11165857931 is 13975856111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11165857931 - 2¹⁸ = 11165595787 is a prime.

It is a super-2 number, since 2×11165857931² (a number of 21 digits) contains 22 as substring.

Together with 11165857933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11165857933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5582928965 + 5582928966.

It is an arithmetic number, because the mean of its divisors is an integer number (5582928966).

Almost surely, 2^11165857931 is an apocalyptic number.

11165857931 is a deficient number, since it is larger than the sum of its proper divisors (1).

11165857931 is an equidigital number, since it uses as much as digits as its factorization.

11165857931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 47.

The spelling of 11165857931 in words is "eleven billion, one hundred sixty-five million, eight hundred fifty-seven thousand, nine hundred thirty-one".