31522521040 has 40 divisors (see below), whose sum is σ = 74491346088. Its totient is φ = 12402301440.

The previous prime is 31522521013. The next prime is 31522521047. The reversal of 31522521040 is 4012522513.

It can be written as a sum of positive squares in 4 ways, for example, as 1189422144 + 30333098896 = 34488^2 + 174164^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 31522520996 and 31522521014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31522521047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3224887 + ... + 3234646.

Almost surely, 2^31522521040 is an apocalyptic number.

It is an amenable number.

31522521040 is an abundant number, since it is smaller than the sum of its proper divisors (42968825048).

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

31522521040 is a wasteful number, since it uses less digits than its factorization.

31522521040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6459607 (or 6459601 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 31522521040 in words is "thirty-one billion, five hundred twenty-two million, five hundred twenty-one thousand, forty".