31123020112 has 10 divisors (see below), whose sum is σ = 60300851498. Its totient is φ = 15561510048.

The previous prime is 31123020107. The next prime is 31123020119. The reversal of 31123020112 is 21102032113.

It can be written as a sum of positive squares in only one way, i.e., 29146684176 + 1976335936 = 170724^2 + 44456^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 1945188757 = 31123020112 / (3 + 1 + 1 + 2 + 3 + 0 + 2 + 0 + 1 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123020119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972594363 + ... + 972594394.

Almost surely, 2^31123020112 is an apocalyptic number.

It is an amenable number.

31123020112 is a deficient number, since it is larger than the sum of its proper divisors (29177831386).

31123020112 is a wasteful number, since it uses less digits than its factorization.

31123020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945188765 (or 1945188759 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31123020112 its reverse (21102032113), we get a palindrome (52225052225).

The spelling of 31123020112 in words is "thirty-one billion, one hundred twenty-three million, twenty thousand, one hundred twelve".