31311123102 has 32 divisors (see below), whose sum is σ = 79520313600. Its totient is φ = 8946035064.

The previous prime is 31311123049. The next prime is 31311123119. The reversal of 31311123102 is 20132111313.

31311123102 is a `hidden beast` number, since 31 + 311 + 12 + 310 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41416452 + ... + 41417207.

It is an arithmetic number, because the mean of its divisors is an integer number (2485009800).

Almost surely, 2^31311123102 is an apocalyptic number.

31311123102 is an abundant number, since it is smaller than the sum of its proper divisors (48209190498).

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

31311123102 is a wasteful number, since it uses less digits than its factorization.

31311123102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82833677 (or 82833671 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31311123102 its reverse (20132111313), we get a palindrome (51443234415).

The spelling of 31311123102 in words is "thirty-one billion, three hundred eleven million, one hundred twenty-three thousand, one hundred two".