31313120 has 96 divisors (see below), whose sum is σ = 78962688. Its totient is φ = 11708928.

The previous prime is 31313119. The next prime is 31313123. The reversal of 31313120 is 2131313.

It is a super-2 number, since 2×31313120² = 1961022968268800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31313095 and 31313104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313123) 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, 246497 + ... + 246623.

It is an arithmetic number, because the mean of its divisors is an integer number (822528).

Almost surely, 2^31313120 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 31313120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39481344).

31313120 is an abundant number, since it is smaller than the sum of its proper divisors (47649568).

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

31313120 is a wasteful number, since it uses less digits than its factorization.

31313120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 31313120 is about 5595.8127202400. The cubic root of 31313120 is about 315.1921897624.

Adding to 31313120 its reverse (2131313), we get a palindrome (33444433).

The spelling of 31313120 in words is "thirty-one million, three hundred thirteen thousand, one hundred twenty".