31123132120 has 64 divisors (see below), whose sum is σ = 71183800800. Its totient is φ = 12244193280.

The previous prime is 31123132097. The next prime is 31123132127. The reversal of 31123132120 is 2123132113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123132127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1762696 + ... + 1780264.

Almost surely, 2^31123132120 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 31123132120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35591900400).

31123132120 is an abundant number, since it is smaller than the sum of its proper divisors (40060668680).

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

31123132120 is a wasteful number, since it uses less digits than its factorization.

31123132120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18308 (or 18304 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31123132120 its reverse (2123132113), we get a palindrome (33246264233).

The spelling of 31123132120 in words is "thirty-one billion, one hundred twenty-three million, one hundred thirty-two thousand, one hundred twenty".