531631639 has 16 divisors (see below), whose sum is σ = 663863040. Its totient is φ = 413602560.

The previous prime is 531631613. The next prime is 531631649. The reversal of 531631639 is 936136135.

It is not a de Polignac number, because 531631639 - 2²¹ = 529534487 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 531631598 and 531631607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531631649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46692 + ... + 56950.

It is an arithmetic number, because the mean of its divisors is an integer number (41491440).

Almost surely, 2^531631639 is an apocalyptic number.

531631639 is a deficient number, since it is larger than the sum of its proper divisors (132231401).

531631639 is a wasteful number, since it uses less digits than its factorization.

531631639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950.

The product of its digits is 43740, while the sum is 37.

The square root of 531631639 is about 23057.1385692154. The cubic root of 531631639 is about 810.0968430672.

The spelling of 531631639 in words is "five hundred thirty-one million, six hundred thirty-one thousand, six hundred thirty-nine".