642931629 has 4 divisors (see below), whose sum is σ = 857242176. Its totient is φ = 428621084.

The previous prime is 642931621. The next prime is 642931669. The reversal of 642931629 is 926139246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642931629 - 2³ = 642931621 is a prime.

It is a super-2 number, since 2×642931629² = 826722159137187282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642931621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107155269 + ... + 107155274.

It is an arithmetic number, because the mean of its divisors is an integer number (214310544).

Almost surely, 2^642931629 is an apocalyptic number.

It is an amenable number.

642931629 is a deficient number, since it is larger than the sum of its proper divisors (214310547).

642931629 is a wasteful number, since it uses less digits than its factorization.

642931629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214310546.

The product of its digits is 139968, while the sum is 42.

The square root of 642931629 is about 25356.0964858552. The cubic root of 642931629 is about 863.0877059795.

The spelling of 642931629 in words is "six hundred forty-two million, nine hundred thirty-one thousand, six hundred twenty-nine".