31243120100 has 36 divisors (see below), whose sum is σ = 68315137968. Its totient is φ = 12401844000.

The previous prime is 31243120031. The next prime is 31243120141. The reversal of 31243120100 is 102134213.

It is a super-2 number, since 2×31243120100² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1179386 + ... + 1205585.

Almost surely, 2^31243120100 is an apocalyptic number.

It is an amenable number.

31243120100 is an abundant number, since it is smaller than the sum of its proper divisors (37072017868).

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

31243120100 is a wasteful number, since it uses less digits than its factorization.

31243120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385116 (or 2385109 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31243120100 its reverse (102134213), we get a palindrome (31345254313).

The spelling of 31243120100 in words is "thirty-one billion, two hundred forty-three million, one hundred twenty thousand, one hundred".