642652031 has 4 divisors (see below), whose sum is σ = 734459472. Its totient is φ = 550844592.

The previous prime is 642651983. The next prime is 642652051. The reversal of 642652031 is 130256246.

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 642652031 - 2⁶ = 642651967 is a prime.

It is a super-2 number, since 2×642652031² = 826003265896849922, 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 = 642651985 and 642652003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642652051) 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, 45903710 + ... + 45903723.

It is an arithmetic number, because the mean of its divisors is an integer number (183614868).

Almost surely, 2^642652031 is an apocalyptic number.

642652031 is a deficient number, since it is larger than the sum of its proper divisors (91807441).

642652031 is an equidigital number, since it uses as much as digits as its factorization.

642652031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91807440.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 642652031 is about 25350.5824587918. The cubic root of 642652031 is about 862.9625746926.

The spelling of 642652031 in words is "six hundred forty-two million, six hundred fifty-two thousand, thirty-one".