13909631 has 2 divisors, whose sum is σ = 13909632. Its totient is φ = 13909630.

The previous prime is 13909627. The next prime is 13909633. The reversal of 13909631 is 13690931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13909631 - 2² = 13909627 is a prime.

It is a super-2 number, since 2×13909631² = 386955669112322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 13909633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13909633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6954815 + 6954816.

It is an arithmetic number, because the mean of its divisors is an integer number (6954816).

Almost surely, 2^13909631 is an apocalyptic number.

13909631 is a deficient number, since it is larger than the sum of its proper divisors (1).

13909631 is an equidigital number, since it uses as much as digits as its factorization.

13909631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 13909631 is about 3729.5617705033. The cubic root of 13909631 is about 240.4945300687.

The spelling of 13909631 in words is "thirteen million, nine hundred nine thousand, six hundred thirty-one".