13531202491 has 4 divisors (see below), whose sum is σ = 13552647184. Its totient is φ = 13509757800.

The previous prime is 13531202467. The next prime is 13531202533. The reversal of 13531202491 is 19420213531.

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 13531202491 - 2⁵ = 13531202459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13531200491) 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, 10721400 + ... + 10722661.

It is an arithmetic number, because the mean of its divisors is an integer number (3388161796).

Almost surely, 2^13531202491 is an apocalyptic number.

13531202491 is a deficient number, since it is larger than the sum of its proper divisors (21444693).

13531202491 is an equidigital number, since it uses as much as digits as its factorization.

13531202491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21444692.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 13531202491 in words is "thirteen billion, five hundred thirty-one million, two hundred two thousand, four hundred ninety-one".