31321316572 has 48 divisors (see below), whose sum is σ = 67552676352. Its totient is φ = 12374066880.

The previous prime is 31321316567. The next prime is 31321316597. The reversal of 31321316572 is 27561312313.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212547 + ... + 328357.

It is an arithmetic number, because the mean of its divisors is an integer number (1407347424).

Almost surely, 2^31321316572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31321316572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33776338176).

31321316572 is an abundant number, since it is smaller than the sum of its proper divisors (36231359780).

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

31321316572 is a wasteful number, since it uses less digits than its factorization.

31321316572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116578 (or 116576 counting only the distinct ones).

The product of its digits is 22680, while the sum is 34.

Adding to 31321316572 its reverse (27561312313), we get a palindrome (58882628885).

The spelling of 31321316572 in words is "thirty-one billion, three hundred twenty-one million, three hundred sixteen thousand, five hundred seventy-two".