31200311120 has 80 divisors (see below), whose sum is σ = 79281229248. Its totient is φ = 11324651520.

The previous prime is 31200311111. The next prime is 31200311143. The reversal of 31200311120 is 2111300213.

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

It is a junction number, because it is equal to n+sod(n) for n = 31200311095 and 31200311104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448952 + ... + 513768.

Almost surely, 2^31200311120 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 31200311120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39640614624).

31200311120 is an abundant number, since it is smaller than the sum of its proper divisors (48080918128).

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

31200311120 is a wasteful number, since it uses less digits than its factorization.

31200311120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65388 (or 65382 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31200311120 its reverse (2111300213), we get a palindrome (33311611333).

The spelling of 31200311120 in words is "thirty-one billion, two hundred million, three hundred eleven thousand, one hundred twenty".