642957307 has 2 divisors, whose sum is σ = 642957308. Its totient is φ = 642957306.

The previous prime is 642957281. The next prime is 642957311. The reversal of 642957307 is 703759246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642957307 - 2¹⁵ = 642924539 is a prime.

It is not a weakly prime, because it can be changed into another prime (642957317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321478653 + 321478654.

It is an arithmetic number, because the mean of its divisors is an integer number (321478654).

Almost surely, 2^642957307 is an apocalyptic number.

642957307 is a deficient number, since it is larger than the sum of its proper divisors (1).

642957307 is an equidigital number, since it uses as much as digits as its factorization.

642957307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 642957307 is about 25356.6028284548. The cubic root of 642957307 is about 863.0991960924.

It can be divided in two parts, 6429 and 57307, that added together give a palindrome (63736).

The spelling of 642957307 in words is "six hundred forty-two million, nine hundred fifty-seven thousand, three hundred seven".