31313022 has 32 divisors (see below), whose sum is σ = 67899552. Its totient is φ = 9569664.

The previous prime is 31313017. The next prime is 31313039. The reversal of 31313022 is 22031313.

It is a junction number, because it is equal to n+sod(n) for n = 31312992 and 31313010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10968 + ... + 13524.

It is an arithmetic number, because the mean of its divisors is an integer number (2121861).

Almost surely, 2^31313022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31313022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33949776).

31313022 is an abundant number, since it is smaller than the sum of its proper divisors (36586530).

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

31313022 is a wasteful number, since it uses less digits than its factorization.

31313022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 31313022 is about 5595.8039636856. The cubic root of 31313022 is about 315.1918609453.

Adding to 31313022 its reverse (22031313), we get a palindrome (53344335).

The spelling of 31313022 in words is "thirty-one million, three hundred thirteen thousand, twenty-two".