31123222000 has 160 divisors (see below), whose sum is σ = 81397540224. Its totient is φ = 11441664000.

The previous prime is 31123221989. The next prime is 31123222019. The reversal of 31123222000 is 22232113.

It is a super-2 number, since 2×31123222000² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6263517 + ... + 6268483.

Almost surely, 2^31123222000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31123222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40698770112).

31123222000 is an abundant number, since it is smaller than the sum of its proper divisors (50274318224).

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

31123222000 is a wasteful number, since it uses less digits than its factorization.

31123222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5244 (or 5228 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31123222000 its reverse (22232113), we get a palindrome (31145454113).

The spelling of 31123222000 in words is "thirty-one billion, one hundred twenty-three million, two hundred twenty-two thousand".