27939631 has 2 divisors, whose sum is σ = 27939632. Its totient is φ = 27939630.

The previous prime is 27939629. The next prime is 27939661. The reversal of 27939631 is 13693972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27939631 - 2¹ = 27939629 is a prime.

It is a super-2 number, since 2×27939631² = 1561245960832322, which contains 22 as substring.

Together with 27939629, 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 (27939661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13969815 + 13969816.

It is an arithmetic number, because the mean of its divisors is an integer number (13969816).

Almost surely, 2^27939631 is an apocalyptic number.

27939631 is a deficient number, since it is larger than the sum of its proper divisors (1).

27939631 is an equidigital number, since it uses as much as digits as its factorization.

27939631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 40.

The square root of 27939631 is about 5285.7952098052. The cubic root of 27939631 is about 303.4405070175.

The spelling of 27939631 in words is "twenty-seven million, nine hundred thirty-nine thousand, six hundred thirty-one".