31090122 has 64 divisors (see below), whose sum is σ = 79522560. Its totient is φ = 8819712.

The previous prime is 31090091. The next prime is 31090133. The reversal of 31090122 is 22109013.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31090095 and 31090104.

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, 87898 + ... + 88250.

It is an arithmetic number, because the mean of its divisors is an integer number (1242540).

Almost surely, 2^31090122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31090122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39761280).

31090122 is an abundant number, since it is smaller than the sum of its proper divisors (48432438).

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

31090122 is a wasteful number, since it uses less digits than its factorization.

31090122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 598 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 31090122 is about 5575.8516838237. The cubic root of 31090122 is about 314.4421873929.

Adding to 31090122 its reverse (22109013), we get a palindrome (53199135).

The spelling of 31090122 in words is "thirty-one million, ninety thousand, one hundred twenty-two".