31213131144 has 64 divisors (see below), whose sum is σ = 88458283200. Its totient is φ = 9098562816.

The previous prime is 31213131137. The next prime is 31213131149. The reversal of 31213131144 is 44113131213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31213131149) 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, 2626759 + ... + 2638614.

It is an arithmetic number, because the mean of its divisors is an integer number (1382160675).

Almost surely, 2^31213131144 is an apocalyptic number.

It is an amenable number.

31213131144 is an abundant number, since it is smaller than the sum of its proper divisors (57245152056).

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

31213131144 is a wasteful number, since it uses less digits than its factorization.

31213131144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5265414 (or 5265410 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

Adding to 31213131144 its reverse (44113131213), we get a palindrome (75326262357).

The spelling of 31213131144 in words is "thirty-one billion, two hundred thirteen million, one hundred thirty-one thousand, one hundred forty-four".