15438513231 has 24 divisors (see below), whose sum is σ = 22394436480. Its totient is φ = 10248887376.

The previous prime is 15438513227. The next prime is 15438513247. The reversal of 15438513231 is 13231583451.

15438513231 is a `hidden beast` number, since 1 + 543 + 8 + 51 + 32 + 31 = 666.

It is not a de Polignac number, because 15438513231 - 2² = 15438513227 is a prime.

It is a super-2 number, since 2×15438513231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15438513281) 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, 2177350 + ... + 2184428.

It is an arithmetic number, because the mean of its divisors is an integer number (933101520).

Almost surely, 2^15438513231 is an apocalyptic number.

15438513231 is a deficient number, since it is larger than the sum of its proper divisors (6955923249).

15438513231 is a wasteful number, since it uses less digits than its factorization.

15438513231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8075 (or 8072 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 15438513231 in words is "fifteen billion, four hundred thirty-eight million, five hundred thirteen thousand, two hundred thirty-one".