13115504431 has 4 divisors (see below), whose sum is σ = 13116825072. Its totient is φ = 13114183792.

The previous prime is 13115504419. The next prime is 13115504449. The reversal of 13115504431 is 13440551131.

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 13115504431 - 2¹⁹ = 13114980143 is a prime.

It is a super-2 number, since 2×13115504431² (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 13115504431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13115504411) 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, 645310 + ... + 665323.

It is an arithmetic number, because the mean of its divisors is an integer number (3279206268).

Almost surely, 2^13115504431 is an apocalyptic number.

13115504431 is a deficient number, since it is larger than the sum of its proper divisors (1320641).

13115504431 is a wasteful number, since it uses less digits than its factorization.

13115504431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320640.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 13115504431 in words is "thirteen billion, one hundred fifteen million, five hundred four thousand, four hundred thirty-one".