27971479 has 2 divisors, whose sum is σ = 27971480. Its totient is φ = 27971478.

The previous prime is 27971467. The next prime is 27971497. The reversal of 27971479 is 97417972.

Together with next prime (27971497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27971479 - 2⁷ = 27971351 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27971179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13985739 + 13985740.

It is an arithmetic number, because the mean of its divisors is an integer number (13985740).

Almost surely, 2^27971479 is an apocalyptic number.

27971479 is a deficient number, since it is larger than the sum of its proper divisors (1).

27971479 is an equidigital number, since it uses as much as digits as its factorization.

27971479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 46.

The square root of 27971479 is about 5288.8069543140. The cubic root of 27971479 is about 303.5557591200. Note that the first 3 decimals are identical.

The spelling of 27971479 in words is "twenty-seven million, nine hundred seventy-one thousand, four hundred seventy-nine".