27431279 has 2 divisors, whose sum is σ = 27431280. Its totient is φ = 27431278.

The previous prime is 27431227. The next prime is 27431281. The reversal of 27431279 is 97213472.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27431279 - 2²⁰ = 26382703 is a prime.

It is a Sophie Germain prime.

Together with 27431281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27431179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13715639 + 13715640.

It is an arithmetic number, because the mean of its divisors is an integer number (13715640).

Almost surely, 2^27431279 is an apocalyptic number.

27431279 is a deficient number, since it is larger than the sum of its proper divisors (1).

27431279 is an equidigital number, since it uses as much as digits as its factorization.

27431279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 27431279 is about 5237.4878520146. The cubic root of 27431279 is about 301.5888994348.

The spelling of 27431279 in words is "twenty-seven million, four hundred thirty-one thousand, two hundred seventy-nine".