27931457 has 2 divisors, whose sum is σ = 27931458. Its totient is φ = 27931456.

The previous prime is 27931439. The next prime is 27931469. The reversal of 27931457 is 75413972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27552001 + 379456 = 5249^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 27931457 - 2⁸ = 27931201 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27931457.

It is not a weakly prime, because it can be changed into another prime (27931487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13965728 + 13965729.

It is an arithmetic number, because the mean of its divisors is an integer number (13965729).

Almost surely, 2^27931457 is an apocalyptic number.

It is an amenable number.

27931457 is a deficient number, since it is larger than the sum of its proper divisors (1).

27931457 is an equidigital number, since it uses as much as digits as its factorization.

27931457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 27931457 is about 5285.0219488664. The cubic root of 27931457 is about 303.4109126798.

The spelling of 27931457 in words is "twenty-seven million, nine hundred thirty-one thousand, four hundred fifty-seven".