625564091 has 2 divisors, whose sum is σ = 625564092. Its totient is φ = 625564090.

The previous prime is 625564087. The next prime is 625564127. The reversal of 625564091 is 190465526.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625564091 - 2² = 625564087 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (625564061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312782045 + 312782046.

It is an arithmetic number, because the mean of its divisors is an integer number (312782046).

Almost surely, 2^625564091 is an apocalyptic number.

625564091 is a deficient number, since it is larger than the sum of its proper divisors (1).

625564091 is an equidigital number, since it uses as much as digits as its factorization.

625564091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 625564091 is about 25011.2792755589. The cubic root of 625564091 is about 855.2451178701.

The spelling of 625564091 in words is "six hundred twenty-five million, five hundred sixty-four thousand, ninety-one".