13291533252 has 36 divisors (see below), whose sum is σ = 33944422876. Its totient is φ = 4384834560.

The previous prime is 13291533221. The next prime is 13291533253. The reversal of 13291533252 is 25233519231.

13291533252 is a `hidden beast` number, since 1 + 32 + 91 + 533 + 2 + 5 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8207272836 + 5084260416 = 90594^2 + 71304^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (13291533253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1899649 + ... + 1906632.

Almost surely, 2^13291533252 is an apocalyptic number.

13291533252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13291533252 is an abundant number, since it is smaller than the sum of its proper divisors (20652889624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13291533252 is a wasteful number, since it uses less digits than its factorization.

13291533252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806388 (or 3806383 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The spelling of 13291533252 in words is "thirteen billion, two hundred ninety-one million, five hundred thirty-three thousand, two hundred fifty-two".