13631139 has 8 divisors (see below), whose sum is σ = 20194320. Its totient is φ = 9087408.

The previous prime is 13631117. The next prime is 13631143. The reversal of 13631139 is 93113631.

13631139 is a `hidden beast` number, since 13 + 631 + 13 + 9 = 666.

It is not a de Polignac number, because 13631139 - 2¹² = 13627043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 504857 = 13631139 / (1 + 3 + 6 + 3 + 1 + 1 + 3 + 9).

It is not an unprimeable number, because it can be changed into a prime (13631159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252402 + ... + 252455.

It is an arithmetic number, because the mean of its divisors is an integer number (2524290).

Almost surely, 2^13631139 is an apocalyptic number.

13631139 is a deficient number, since it is larger than the sum of its proper divisors (6563181).

13631139 is an equidigital number, since it uses as much as digits as its factorization.

13631139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504866 (or 504860 counting only the distinct ones).

The product of its digits is 1458, while the sum is 27.

The square root of 13631139 is about 3692.0372424991. The cubic root of 13631139 is about 238.8786753721.

The spelling of 13631139 in words is "thirteen million, six hundred thirty-one thousand, one hundred thirty-nine".