642801431 has 4 divisors (see below), whose sum is σ = 645173664. Its totient is φ = 640429200.

The previous prime is 642801377. The next prime is 642801479. The reversal of 642801431 is 134108246.

642801431 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 642801431 - 2²⁶ = 575692567 is a prime.

It is a super-2 number, since 2×642801431² = 826387359391295522, 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 = 642801394 and 642801403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642801031) 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, 1185710 + ... + 1186251.

It is an arithmetic number, because the mean of its divisors is an integer number (161293416).

Almost surely, 2^642801431 is an apocalyptic number.

642801431 is a deficient number, since it is larger than the sum of its proper divisors (2372233).

642801431 is a wasteful number, since it uses less digits than its factorization.

642801431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2372232.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 642801431 is about 25353.5289654123. The cubic root of 642801431 is about 863.0294416818.

Adding to 642801431 its reverse (134108246), we get a palindrome (776909677).

The spelling of 642801431 in words is "six hundred forty-two million, eight hundred one thousand, four hundred thirty-one".