642053631 has 8 divisors (see below), whose sum is σ = 856301184. Its totient is φ = 427920920.

The previous prime is 642053627. The next prime is 642053641. The reversal of 642053631 is 136350246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642053631 - 2² = 642053627 is a prime.

It is a super-2 number, since 2×642053631² = 824465730160568322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642053641) 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 7 ways as a sum of consecutive naturals, for example, 14685 + ... + 38726.

It is an arithmetic number, because the mean of its divisors is an integer number (107037648).

Almost surely, 2^642053631 is an apocalyptic number.

642053631 is a deficient number, since it is larger than the sum of its proper divisors (214247553).

642053631 is a wasteful number, since it uses less digits than its factorization.

642053631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57421.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 642053631 is about 25338.7772199055. Note that the first 3 decimals coincide. The cubic root of 642053631 is about 862.6946447491.

The spelling of 642053631 in words is "six hundred forty-two million, fifty-three thousand, six hundred thirty-one".