646315687 has 2 divisors, whose sum is σ = 646315688. Its totient is φ = 646315686.

The previous prime is 646315633. The next prime is 646315697. The reversal of 646315687 is 786513646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646315687 - 2¹⁵ = 646282919 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 (646315697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323157843 + 323157844.

It is an arithmetic number, because the mean of its divisors is an integer number (323157844).

Almost surely, 2^646315687 is an apocalyptic number.

646315687 is a deficient number, since it is larger than the sum of its proper divisors (1).

646315687 is an equidigital number, since it uses as much as digits as its factorization.

646315687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 46.

The square root of 646315687 is about 25422.7395652003. The cubic root of 646315687 is about 864.5993386527.

The spelling of 646315687 in words is "six hundred forty-six million, three hundred fifteen thousand, six hundred eighty-seven".