31123020100 has 36 divisors (see below), whose sum is σ = 67598423424. Its totient is φ = 12437877280.

The previous prime is 31123020043. The next prime is 31123020107. The reversal of 31123020100 is 102032113.

It is not an unprimeable number, because it can be changed into a prime (31123020107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30784 + ... + 251383.

It is an arithmetic number, because the mean of its divisors is an integer number (1877733984).

Almost surely, 2^31123020100 is an apocalyptic number.

It is an amenable number.

31123020100 is an abundant number, since it is smaller than the sum of its proper divisors (36475403324).

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

31123020100 is a wasteful number, since it uses less digits than its factorization.

31123020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283284 (or 283277 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31123020100 its reverse (102032113), we get a palindrome (31225052213).

The spelling of 31123020100 in words is "thirty-one billion, one hundred twenty-three million, twenty thousand, one hundred".