31311223000 has 32 divisors (see below), whose sum is σ = 73268264160. Its totient is φ = 12524488800.

The previous prime is 31311222991. The next prime is 31311223003. The reversal of 31311223000 is 32211313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311223003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15654612 + ... + 15656611.

It is an arithmetic number, because the mean of its divisors is an integer number (2289633255).

Almost surely, 2^31311223000 is an apocalyptic number.

It is an amenable number.

31311223000 is an abundant number, since it is smaller than the sum of its proper divisors (41957041160).

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

31311223000 is a wasteful number, since it uses less digits than its factorization.

31311223000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31311244 (or 31311230 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31311223000 its reverse (32211313), we get a palindrome (31343434313).

The spelling of 31311223000 in words is "thirty-one billion, three hundred eleven million, two hundred twenty-three thousand".