27972489631 has 2 divisors, whose sum is σ = 27972489632. Its totient is φ = 27972489630.

The previous prime is 27972489551. The next prime is 27972489637. The reversal of 27972489631 is 13698427972.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27972489631 - 2⁹ = 27972489119 is a prime.

It is a super-2 number, since 2×27972489631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27972489637) 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 as a sum of consecutive naturals, namely, 13986244815 + 13986244816.

It is an arithmetic number, because the mean of its divisors is an integer number (13986244816).

Almost surely, 2^27972489631 is an apocalyptic number.

27972489631 is a deficient number, since it is larger than the sum of its proper divisors (1).

27972489631 is an equidigital number, since it uses as much as digits as its factorization.

27972489631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 58.

The spelling of 27972489631 in words is "twenty-seven billion, nine hundred seventy-two million, four hundred eighty-nine thousand, six hundred thirty-one".