642931699 has 2 divisors, whose sum is σ = 642931700. Its totient is φ = 642931698.

The previous prime is 642931697. The next prime is 642931717. The reversal of 642931699 is 996139246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642931699 - 2¹ = 642931697 is a prime.

It is a super-2 number, since 2×642931699² = 826722339158053202, which contains 22 as substring.

Together with 642931697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (642931691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321465849 + 321465850.

It is an arithmetic number, because the mean of its divisors is an integer number (321465850).

Almost surely, 2^642931699 is an apocalyptic number.

642931699 is a deficient number, since it is larger than the sum of its proper divisors (1).

642931699 is an equidigital number, since it uses as much as digits as its factorization.

642931699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 49.

The square root of 642931699 is about 25356.0978661938. The cubic root of 642931699 is about 863.0877373027.

The spelling of 642931699 in words is "six hundred forty-two million, nine hundred thirty-one thousand, six hundred ninety-nine".