31240040312 has 64 divisors (see below), whose sum is σ = 66666499200. Its totient is φ = 13604976000.

The previous prime is 31240040311. The next prime is 31240040357. The reversal of 31240040312 is 21304004213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240040311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464483 + ... + 527469.

It is an arithmetic number, because the mean of its divisors is an integer number (1041664050).

Almost surely, 2^31240040312 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 31240040312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33333249600).

31240040312 is an abundant number, since it is smaller than the sum of its proper divisors (35426458888).

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

31240040312 is a wasteful number, since it uses less digits than its factorization.

31240040312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63276 (or 63272 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31240040312 its reverse (21304004213), we get a palindrome (52544044525).

The spelling of 31240040312 in words is "thirty-one billion, two hundred forty million, forty thousand, three hundred twelve".