13215631325 has 48 divisors (see below), whose sum is σ = 18750414480. Its totient is φ = 9167800320.

The previous prime is 13215631301. The next prime is 13215631333. The reversal of 13215631325 is 52313651231.

It can be written as a sum of positive squares in 24 ways, for example, as 11725208089 + 1490423236 = 108283^2 + 38606^2 .

It is not a de Polignac number, because 13215631325 - 2¹⁶ = 13215565789 is a prime.

It is a super-2 number, since 2×13215631325² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13215631291 and 13215631300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 329777 + ... + 367673.

It is an arithmetic number, because the mean of its divisors is an integer number (390633635).

Almost surely, 2^13215631325 is an apocalyptic number.

It is an amenable number.

13215631325 is a deficient number, since it is larger than the sum of its proper divisors (5534783155).

13215631325 is a wasteful number, since it uses less digits than its factorization.

13215631325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37986 (or 37981 counting only the distinct ones).

The product of its digits is 16200, while the sum is 32.

The spelling of 13215631325 in words is "thirteen billion, two hundred fifteen million, six hundred thirty-one thousand, three hundred twenty-five".