31100120100 has 180 divisors, whose sum is σ = 115216556224. Its totient is φ = 7108585920.

The previous prime is 31100120087. The next prime is 31100120123. The reversal of 31100120100 is 102100113.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 217552 + ... + 330951.

Almost surely, 2^31100120100 is an apocalyptic number.

31100120100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31100120100 is an abundant number, since it is smaller than the sum of its proper divisors (84116436124).

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

31100120100 is a wasteful number, since it uses less digits than its factorization.

31100120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548536 (or 548520 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 31100120100 its reverse (102100113), we get a palindrome (31202220213).

The spelling of 31100120100 in words is "thirty-one billion, one hundred million, one hundred twenty thousand, one hundred".