31311103312 has 10 divisors (see below), whose sum is σ = 60665262698. Its totient is φ = 15655551648.

The previous prime is 31311103283. The next prime is 31311103339. The reversal of 31311103312 is 21330111313.

It can be written as a sum of positive squares in only one way, i.e., 20660037696 + 10651065616 = 143736^2 + 103204^2 .

It is a super-2 number, since 2×31311103312² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31311103312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978471963 + ... + 978471994.

Almost surely, 2^31311103312 is an apocalyptic number.

It is an amenable number.

31311103312 is a deficient number, since it is larger than the sum of its proper divisors (29354159386).

31311103312 is a wasteful number, since it uses less digits than its factorization.

31311103312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956943965 (or 1956943959 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31311103312 its reverse (21330111313), we get a palindrome (52641214625).

The spelling of 31311103312 in words is "thirty-one billion, three hundred eleven million, one hundred three thousand, three hundred twelve".