31000112100 has 72 divisors (see below), whose sum is σ = 99659628320. Its totient is φ = 8266695840.

The previous prime is 31000112081. The next prime is 31000112159. The reversal of 31000112100 is 121100013.

It is a super-2 number, since 2×31000112100² (a number of 22 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 5738062 + ... + 5743461.

Almost surely, 2^31000112100 is an apocalyptic number.

31000112100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31000112100 is an abundant number, since it is smaller than the sum of its proper divisors (68659516220).

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

31000112100 is a wasteful number, since it uses less digits than its factorization.

31000112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11481546 (or 11481533 counting only the distinct ones).

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

Adding to 31000112100 its reverse (121100013), we get a palindrome (31121212113).

The spelling of 31000112100 in words is "thirty-one billion, one hundred twelve thousand, one hundred".