13213831 has 2 divisors, whose sum is σ = 13213832. Its totient is φ = 13213830.

The previous prime is 13213829. The next prime is 13213841. The reversal of 13213831 is 13831231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13213831 - 2¹ = 13213829 is a prime.

It is a super-2 number, since 2×13213831² = 349210659393122, which contains 22 as substring.

Together with 13213829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13213841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606915 + 6606916.

It is an arithmetic number, because the mean of its divisors is an integer number (6606916).

Almost surely, 2^13213831 is an apocalyptic number.

13213831 is a deficient number, since it is larger than the sum of its proper divisors (1).

13213831 is an equidigital number, since it uses as much as digits as its factorization.

13213831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 13213831 is about 3635.0833553029. The cubic root of 13213831 is about 236.4156648108.

The spelling of 13213831 in words is "thirteen million, two hundred thirteen thousand, eight hundred thirty-one".