31311222000 has 80 divisors (see below), whose sum is σ = 100947399072. Its totient is φ = 8349657600.

The previous prime is 31311221993. The next prime is 31311222043. The reversal of 31311222000 is 22211313.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2603269 + ... + 2615268.

Almost surely, 2^31311222000 is an apocalyptic number.

31311222000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31311222000 is an abundant number, since it is smaller than the sum of its proper divisors (69636177072).

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

31311222000 is a wasteful number, since it uses less digits than its factorization.

31311222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5218563 (or 5218547 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31311222000 its reverse (22211313), we get a palindrome (31333433313).

The spelling of 31311222000 in words is "thirty-one billion, three hundred eleven million, two hundred twenty-two thousand".