31310000000 has 256 divisors, whose sum is σ = 81281041920. Its totient is φ = 12000000000.

The previous prime is 31309999993. The next prime is 31310000023. The reversal of 31310000000 is 1313.

It is a super-2 number, since 2×31310000000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (8).

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, 309999950 + ... + 310000050.

It is an arithmetic number, because the mean of its divisors is an integer number (317504070).

Almost surely, 2^31310000000 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 31310000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40640520960).

31310000000 is an abundant number, since it is smaller than the sum of its proper divisors (49971041920).

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

31310000000 is an frugal number, since it uses more digits than its factorization.

31310000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 9, while the sum is 8.

Adding to 31310000000 its reverse (1313), we get a palindrome (31310001313).

The spelling of 31310000000 in words is "thirty-one billion, three hundred ten million", and thus it is an aban number.