31123040100 has 36 divisors (see below), whose sum is σ = 90049330224. Its totient is φ = 8299477280.

The previous prime is 31123040087. The next prime is 31123040131. The reversal of 31123040100 is 104032113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31123040100.

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, 51871434 + ... + 51872033.

It is an arithmetic number, because the mean of its divisors is an integer number (2501370284).

Almost surely, 2^31123040100 is an apocalyptic number.

31123040100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31123040100 is an abundant number, since it is smaller than the sum of its proper divisors (58926290124).

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

31123040100 is a wasteful number, since it uses less digits than its factorization.

31123040100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103743484 (or 103743477 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31123040100 its reverse (104032113), we get a palindrome (31227072213).

The spelling of 31123040100 in words is "thirty-one billion, one hundred twenty-three million, forty thousand, one hundred".