27621631 has 2 divisors, whose sum is σ = 27621632. Its totient is φ = 27621630.

The previous prime is 27621599. The next prime is 27621641. The reversal of 27621631 is 13612672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27621631 - 2⁵ = 27621599 is a prime.

It is a super-2 number, since 2×27621631² = 1525908998200322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27621631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27621641) 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, 13810815 + 13810816.

It is an arithmetic number, because the mean of its divisors is an integer number (13810816).

Almost surely, 2^27621631 is an apocalyptic number.

27621631 is a deficient number, since it is larger than the sum of its proper divisors (1).

27621631 is an equidigital number, since it uses as much as digits as its factorization.

27621631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 28.

The square root of 27621631 is about 5255.6285066584. The cubic root of 27621631 is about 302.2848904419.

The spelling of 27621631 in words is "twenty-seven million, six hundred twenty-one thousand, six hundred thirty-one".