642357031 has 4 divisors (see below), whose sum is σ = 644208552. Its totient is φ = 640505512.

The previous prime is 642356999. The next prime is 642357061. The reversal of 642357031 is 130753246.

642357031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642357031 - 2⁵ = 642356999 is a prime.

It is a super-2 number, since 2×642357031² = 825245110550269922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642356984 and 642357002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642357061) 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, 925240 + ... + 925933.

It is an arithmetic number, because the mean of its divisors is an integer number (161052138).

Almost surely, 2^642357031 is an apocalyptic number.

642357031 is a deficient number, since it is larger than the sum of its proper divisors (1851521).

642357031 is a wasteful number, since it uses less digits than its factorization.

642357031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1851520.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 642357031 is about 25344.7633841786. The cubic root of 642357031 is about 862.8305110408.

The spelling of 642357031 in words is "six hundred forty-two million, three hundred fifty-seven thousand, thirty-one".