631326520 has 64 divisors (see below), whose sum is σ = 1603087200. Its totient is φ = 221652480.

The previous prime is 631326511. The next prime is 631326529. The reversal of 631326520 is 25623136.

It is an interprime number because it is at equal distance from previous prime (631326511) and next prime (631326529).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631326529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11979 + ... + 37498.

Almost surely, 2^631326520 is an apocalyptic number.

It is an amenable number.

631326520 is an abundant number, since it is smaller than the sum of its proper divisors (971760680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

631326520 is a wasteful number, since it uses less digits than its factorization.

631326520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49528 (or 49524 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 631326520 is about 25126.2118115724. The cubic root of 631326520 is about 857.8631463434.

Adding to 631326520 its reverse (25623136), we get a palindrome (656949656).

The spelling of 631326520 in words is "six hundred thirty-one million, three hundred twenty-six thousand, five hundred twenty".