31313121140 has 48 divisors (see below), whose sum is σ = 76750474752. Its totient is φ = 10507501056.

The previous prime is 31313121137. The next prime is 31313121163. The reversal of 31313121140 is 4112131313.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 2372837 + ... + 2385996.

It is an arithmetic number, because the mean of its divisors is an integer number (1598968224).

Almost surely, 2^31313121140 is an apocalyptic number.

It is an amenable number.

31313121140 is an abundant number, since it is smaller than the sum of its proper divisors (45437353612).

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

31313121140 is a wasteful number, since it uses less digits than its factorization.

31313121140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758896 (or 4758894 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31313121140 its reverse (4112131313), we get a palindrome (35425252453).

The spelling of 31313121140 in words is "thirty-one billion, three hundred thirteen million, one hundred twenty-one thousand, one hundred forty".