31530142236 has 24 divisors (see below), whose sum is σ = 76107240720. Its totient is φ = 10147631872.

The previous prime is 31530142187. The next prime is 31530142243. The reversal of 31530142236 is 63224103513.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45301581 + ... + 45302276.

It is an arithmetic number, because the mean of its divisors is an integer number (3171135030).

Almost surely, 2^31530142236 is an apocalyptic number.

It is an amenable number.

31530142236 is an abundant number, since it is smaller than the sum of its proper divisors (44577098484).

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

31530142236 is a wasteful number, since it uses less digits than its factorization.

31530142236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90603893 (or 90603891 counting only the distinct ones).

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

Adding to 31530142236 its reverse (63224103513), we get a palindrome (94754245749).

The spelling of 31530142236 in words is "thirty-one billion, five hundred thirty million, one hundred forty-two thousand, two hundred thirty-six".