15131213523 has 24 divisors (see below), whose sum is σ = 22006604256. Its totient is φ = 10018166400.

The previous prime is 15131213519. The next prime is 15131213561. The reversal of 15131213523 is 32531213151.

15131213523 is a `hidden beast` number, since 1 + 5 + 13 + 121 + 3 + 523 = 666.

It is not a de Polignac number, because 15131213523 - 2² = 15131213519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15131213023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1981653 + ... + 1989273.

It is an arithmetic number, because the mean of its divisors is an integer number (916941844).

Almost surely, 2^15131213523 is an apocalyptic number.

15131213523 is a deficient number, since it is larger than the sum of its proper divisors (6875390733).

15131213523 is a wasteful number, since it uses less digits than its factorization.

15131213523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9115 (or 9112 counting only the distinct ones).

The product of its digits is 2700, while the sum is 27.

Adding to 15131213523 its reverse (32531213151), we get a palindrome (47662426674).

The spelling of 15131213523 in words is "fifteen billion, one hundred thirty-one million, two hundred thirteen thousand, five hundred twenty-three".