13531926491 has 4 divisors (see below), whose sum is σ = 13897654272. Its totient is φ = 13166198712.

The previous prime is 13531926479. The next prime is 13531926493. The reversal of 13531926491 is 19462913531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19462913531 = 15299 ⋅1272169.

It is a cyclic number.

It is not a de Polignac number, because 13531926491 - 2²⁶ = 13464817627 is a prime.

It is a super-2 number, since 2×13531926491² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13531926493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182863835 + ... + 182863908.

It is an arithmetic number, because the mean of its divisors is an integer number (3474413568).

Almost surely, 2^13531926491 is an apocalyptic number.

13531926491 is a deficient number, since it is larger than the sum of its proper divisors (365727781).

13531926491 is an equidigital number, since it uses as much as digits as its factorization.

13531926491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365727780.

The product of its digits is 174960, while the sum is 44.

The spelling of 13531926491 in words is "thirteen billion, five hundred thirty-one million, nine hundred twenty-six thousand, four hundred ninety-one".