640315051 has 2 divisors, whose sum is σ = 640315052. Its totient is φ = 640315050.

The previous prime is 640315003. The next prime is 640315057. The reversal of 640315051 is 150513046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 640315051 - 2²⁷ = 506097323 is a prime.

It is not a weakly prime, because it can be changed into another prime (640315057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320157525 + 320157526.

It is an arithmetic number, because the mean of its divisors is an integer number (320157526).

Almost surely, 2^640315051 is an apocalyptic number.

640315051 is a deficient number, since it is larger than the sum of its proper divisors (1).

640315051 is an equidigital number, since it uses as much as digits as its factorization.

640315051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 640315051 is about 25304.4472573498. The cubic root of 640315051 is about 861.9152604830.

Adding to 640315051 its reverse (150513046), we get a palindrome (790828097).

The spelling of 640315051 in words is "six hundred forty million, three hundred fifteen thousand, fifty-one".