31122256 has 40 divisors (see below), whose sum is σ = 66495744. Its totient is φ = 13992960.

The previous prime is 31122253. The next prime is 31122269. The reversal of 31122256 is 65222113.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31122253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16161 + ... + 17983.

Almost surely, 2^31122256 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 31122256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33247872).

31122256 is an abundant number, since it is smaller than the sum of its proper divisors (35373488).

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

31122256 is a wasteful number, since it uses less digits than its factorization.

31122256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939 (or 1933 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 31122256 is about 5578.7324725246. The cubic root of 31122256 is about 314.5504833769.

Adding to 31122256 its reverse (65222113), we get a palindrome (96344369).

The spelling of 31122256 in words is "thirty-one million, one hundred twenty-two thousand, two hundred fifty-six".