13131515231 has 4 divisors (see below), whose sum is σ = 13132738464. Its totient is φ = 13130292000.

The previous prime is 13131515213. The next prime is 13131515237. The reversal of 13131515231 is 13251513131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13251513131 = 1627 ⋅8144753.

It is a cyclic number.

It is not a de Polignac number, because 13131515231 - 2⁶ = 13131515167 is a prime.

It is a super-2 number, since 2×13131515231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13131515231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131515237) 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, 595370 + ... + 617031.

It is an arithmetic number, because the mean of its divisors is an integer number (3283184616).

Almost surely, 2^13131515231 is an apocalyptic number.

13131515231 is a deficient number, since it is larger than the sum of its proper divisors (1223233).

13131515231 is a wasteful number, since it uses less digits than its factorization.

13131515231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223232.

The product of its digits is 1350, while the sum is 26.

The spelling of 13131515231 in words is "thirteen billion, one hundred thirty-one million, five hundred fifteen thousand, two hundred thirty-one".