27215971 has 2 divisors, whose sum is σ = 27215972. Its totient is φ = 27215970.

The previous prime is 27215957. The next prime is 27215987. The reversal of 27215971 is 17951272.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27215971 - 2⁹ = 27215459 is a prime.

It is not a weakly prime, because it can be changed into another prime (27215911) 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, 13607985 + 13607986.

It is an arithmetic number, because the mean of its divisors is an integer number (13607986).

Almost surely, 2^27215971 is an apocalyptic number.

27215971 is a deficient number, since it is larger than the sum of its proper divisors (1).

27215971 is an equidigital number, since it uses as much as digits as its factorization.

27215971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 34.

The square root of 27215971 is about 5216.8928491967. The cubic root of 27215971 is about 300.7977692595.

The spelling of 27215971 in words is "twenty-seven million, two hundred fifteen thousand, nine hundred seventy-one".