642460051 has 2 divisors, whose sum is σ = 642460052. Its totient is φ = 642460050.

The previous prime is 642460019. The next prime is 642460057. The reversal of 642460051 is 150064246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642460051 - 2⁵ = 642460019 is a prime.

It is not a weakly prime, because it can be changed into another prime (642460057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321230025 + 321230026.

It is an arithmetic number, because the mean of its divisors is an integer number (321230026).

Almost surely, 2^642460051 is an apocalyptic number.

642460051 is a deficient number, since it is larger than the sum of its proper divisors (1).

642460051 is an equidigital number, since it uses as much as digits as its factorization.

642460051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 642460051 is about 25346.7956751933. The cubic root of 642460051 is about 862.8766349477.

The spelling of 642460051 in words is "six hundred forty-two million, four hundred sixty thousand, fifty-one".