31123312000 has 256 divisors, whose sum is σ = 84968170560. Its totient is φ = 11243520000.

The previous prime is 31123311991. The next prime is 31123312021. The reversal of 31123312000 is 21332113.

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, 31855512 + ... + 31856488.

Almost surely, 2^31123312000 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 31123312000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42484085280).

31123312000 is an abundant number, since it is smaller than the sum of its proper divisors (53844858560).

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

31123312000 is a wasteful number, since it uses less digits than its factorization.

31123312000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198 (or 1176 counting only the distinct ones).

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

Adding to 31123312000 its reverse (21332113), we get a palindrome (31144644113).

The spelling of 31123312000 in words is "thirty-one billion, one hundred twenty-three million, three hundred twelve thousand".