31013011320 has 128 divisors (see below), whose sum is σ = 96128225280. Its totient is φ = 7996032000.

The previous prime is 31013011319. The next prime is 31013011339. The reversal of 31013011320 is 2311031013.

It is a super-2 number, since 2×31013011320² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31013011320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4910965 + ... + 4917275.

It is an arithmetic number, because the mean of its divisors is an integer number (751001760).

Almost surely, 2^31013011320 is an apocalyptic number.

31013011320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31013011320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48064112640).

31013011320 is an abundant number, since it is smaller than the sum of its proper divisors (65115213960).

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

31013011320 is a wasteful number, since it uses less digits than its factorization.

31013011320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7677 (or 7673 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 31013011320 its reverse (2311031013), we get a palindrome (33324042333).

The spelling of 31013011320 in words is "thirty-one billion, thirteen million, eleven thousand, three hundred twenty".