11731515257 has 16 divisors (see below), whose sum is σ = 14631926400. Its totient is φ = 9137927040.

The previous prime is 11731515253. The next prime is 11731515259. The reversal of 11731515257 is 75251513711.

It is a happy number.

It is not a de Polignac number, because 11731515257 - 2² = 11731515253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11731515257.

It is not an unprimeable number, because it can be changed into a prime (11731515253) 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 15 ways as a sum of consecutive naturals, for example, 182219 + ... + 238047.

It is an arithmetic number, because the mean of its divisors is an integer number (914495400).

Almost surely, 2^11731515257 is an apocalyptic number.

It is an amenable number.

11731515257 is a deficient number, since it is larger than the sum of its proper divisors (2900411143).

11731515257 is a wasteful number, since it uses less digits than its factorization.

11731515257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58576.

The product of its digits is 36750, while the sum is 38.

The spelling of 11731515257 in words is "eleven billion, seven hundred thirty-one million, five hundred fifteen thousand, two hundred fifty-seven".