215604971 has 2 divisors, whose sum is σ = 215604972. Its totient is φ = 215604970.

The previous prime is 215604953. The next prime is 215605001. The reversal of 215604971 is 179406512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215604971 - 2¹⁴ = 215588587 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (215604941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107802485 + 107802486.

It is an arithmetic number, because the mean of its divisors is an integer number (107802486).

Almost surely, 2^215604971 is an apocalyptic number.

215604971 is a deficient number, since it is larger than the sum of its proper divisors (1).

215604971 is an equidigital number, since it uses as much as digits as its factorization.

215604971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 215604971 is about 14683.4931470682. The cubic root of 215604971 is about 599.6340092040.

The spelling of 215604971 in words is "two hundred fifteen million, six hundred four thousand, nine hundred seventy-one".