642498291 has 16 divisors (see below), whose sum is σ = 952348800. Its totient is φ = 428107464.

The previous prime is 642498271. The next prime is 642498301. The reversal of 642498291 is 192894246.

It is not a de Polignac number, because 642498291 - 2⁷ = 642498163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642498271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58300 + ... + 68438.

It is an arithmetic number, because the mean of its divisors is an integer number (59521800).

Almost surely, 2^642498291 is an apocalyptic number.

642498291 is a deficient number, since it is larger than the sum of its proper divisors (309850509).

642498291 is a wasteful number, since it uses less digits than its factorization.

642498291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12495 (or 12489 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 642498291 is about 25347.5499999507. The cubic root of 642498291 is about 862.8937544287.

The spelling of 642498291 in words is "six hundred forty-two million, four hundred ninety-eight thousand, two hundred ninety-one".