27745631 has 2 divisors, whose sum is σ = 27745632. Its totient is φ = 27745630.

The previous prime is 27745579. The next prime is 27745633. The reversal of 27745631 is 13654772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27745631 - 2¹⁸ = 27483487 is a prime.

It is a super-2 number, since 2×27745631² = 1539640079176322, which contains 22 as substring.

Together with 27745633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27745591 and 27745600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27745633) 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, 13872815 + 13872816.

It is an arithmetic number, because the mean of its divisors is an integer number (13872816).

Almost surely, 2^27745631 is an apocalyptic number.

27745631 is a deficient number, since it is larger than the sum of its proper divisors (1).

27745631 is an equidigital number, since it uses as much as digits as its factorization.

27745631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35280, while the sum is 35.

The square root of 27745631 is about 5267.4121729745. The cubic root of 27745631 is about 302.7365578977.

The spelling of 27745631 in words is "twenty-seven million, seven hundred forty-five thousand, six hundred thirty-one".