13899631 has 2 divisors, whose sum is σ = 13899632. Its totient is φ = 13899630.

The previous prime is 13899629. The next prime is 13899637. The reversal of 13899631 is 13699831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13899631 - 2¹ = 13899629 is a prime.

It is a super-2 number, since 2×13899631² = 386399483872322, which contains 22 as substring.

Together with 13899629, 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 (13899637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6949815 + 6949816.

It is an arithmetic number, because the mean of its divisors is an integer number (6949816).

Almost surely, 2^13899631 is an apocalyptic number.

13899631 is a deficient number, since it is larger than the sum of its proper divisors (1).

13899631 is an equidigital number, since it uses as much as digits as its factorization.

13899631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 40.

The square root of 13899631 is about 3728.2208893787. The cubic root of 13899631 is about 240.4368836351.

The spelling of 13899631 in words is "thirteen million, eight hundred ninety-nine thousand, six hundred thirty-one".