31350312532 has 72 divisors (see below), whose sum is σ = 69028064000. Its totient is φ = 12195057600.

The previous prime is 31350312481. The next prime is 31350312533. The reversal of 31350312532 is 23521305313.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 31350312532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31350312533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2232469 + ... + 2246467.

Almost surely, 2^31350312532 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 31350312532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34514032000).

31350312532 is an abundant number, since it is smaller than the sum of its proper divisors (37677751468).

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

31350312532 is a wasteful number, since it uses less digits than its factorization.

31350312532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14693 (or 14680 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 28.

Adding to 31350312532 its reverse (23521305313), we get a palindrome (54871617845).

The spelling of 31350312532 in words is "thirty-one billion, three hundred fifty million, three hundred twelve thousand, five hundred thirty-two".