642260931 has 16 divisors (see below), whose sum is σ = 922705056. Its totient is φ = 395030016.

The previous prime is 642260921. The next prime is 642260939. The reversal of 642260931 is 139062246.

It is not a de Polignac number, because 642260931 - 2²⁷ = 508043203 is a prime.

It is a super-2 number, since 2×642260931² = 824998206977973522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642260892 and 642260901.

It is not an unprimeable number, because it can be changed into a prime (642260939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107581 + ... + 113393.

It is an arithmetic number, because the mean of its divisors is an integer number (57669066).

Almost surely, 2^642260931 is an apocalyptic number.

642260931 is a deficient number, since it is larger than the sum of its proper divisors (280444125).

642260931 is a wasteful number, since it uses less digits than its factorization.

642260931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 642260931 is about 25342.8674581232. The cubic root of 642260931 is about 862.7874808963.

The spelling of 642260931 in words is "six hundred forty-two million, two hundred sixty thousand, nine hundred thirty-one".