13209494231 has 4 divisors (see below), whose sum is σ = 13209928200. Its totient is φ = 13209060264.

The previous prime is 13209494189. The next prime is 13209494237. The reversal of 13209494231 is 13249490231.

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 13209494231 - 2¹⁸ = 13209232087 is a prime.

It is a super-2 number, since 2×13209494231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13209494237) 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, 167576 + ... + 233453.

It is an arithmetic number, because the mean of its divisors is an integer number (3302482050).

Almost surely, 2^13209494231 is an apocalyptic number.

13209494231 is a deficient number, since it is larger than the sum of its proper divisors (433969).

13209494231 is an equidigital number, since it uses as much as digits as its factorization.

13209494231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433968.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 13209494231 in words is "thirteen billion, two hundred nine million, four hundred ninety-four thousand, two hundred thirty-one".