642025431 has 6 divisors (see below), whose sum is σ = 927370080. Its totient is φ = 428016948.

The previous prime is 642025399. The next prime is 642025481. The reversal of 642025431 is 134520246.

642025431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642025431 - 2⁵ = 642025399 is a prime.

It is a super-2 number, since 2×642025431² = 824393308101471522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642025395 and 642025404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642025481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35668071 + ... + 35668088.

It is an arithmetic number, because the mean of its divisors is an integer number (154561680).

Almost surely, 2^642025431 is an apocalyptic number.

642025431 is a deficient number, since it is larger than the sum of its proper divisors (285344649).

642025431 is a wasteful number, since it uses less digits than its factorization.

642025431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71336165 (or 71336162 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 642025431 is about 25338.2207544255. The cubic root of 642025431 is about 862.6820142646.

Adding to 642025431 its reverse (134520246), we get a palindrome (776545677).

The spelling of 642025431 in words is "six hundred forty-two million, twenty-five thousand, four hundred thirty-one".