31313213400 has 96 divisors (see below), whose sum is σ = 110938256640. Its totient is φ = 7157304960.

The previous prime is 31313213389. The next prime is 31313213419. The reversal of 31313213400 is 431231313.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3723564 + ... + 3731963.

It is an arithmetic number, because the mean of its divisors is an integer number (1155606840).

Almost surely, 2^31313213400 is an apocalyptic number.

31313213400 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31313213400 is an abundant number, since it is smaller than the sum of its proper divisors (79625043240).

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

31313213400 is a wasteful number, since it uses less digits than its factorization.

31313213400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7455553 (or 7455544 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31313213400 its reverse (431231313), we get a palindrome (31744444713).

The spelling of 31313213400 in words is "thirty-one billion, three hundred thirteen million, two hundred thirteen thousand, four hundred".