11545640831 has 4 divisors (see below), whose sum is σ = 12224796192. Its totient is φ = 10866485472.

The previous prime is 11545640807. The next prime is 11545640879. The reversal of 11545640831 is 13804654511.

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

It is a cyclic number.

It is not a de Polignac number, because 11545640831 - 2³⁰ = 10471899007 is a prime.

It is a super-2 number, since 2×11545640831² (a number of 21 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 (11545640801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339577655 + ... + 339577688.

It is an arithmetic number, because the mean of its divisors is an integer number (3056199048).

Almost surely, 2^11545640831 is an apocalyptic number.

11545640831 is a deficient number, since it is larger than the sum of its proper divisors (679155361).

11545640831 is an equidigital number, since it uses as much as digits as its factorization.

11545640831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679155360.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 11545640831 in words is "eleven billion, five hundred forty-five million, six hundred forty thousand, eight hundred thirty-one".