31321044 has 72 divisors (see below), whose sum is σ = 86268000. Its totient is φ = 9543744.

The previous prime is 31321033. The next prime is 31321049. The reversal of 31321044 is 44012313.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321049) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 19047 + ... + 20625.

Almost surely, 2^31321044 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 31321044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43134000).

31321044 is an abundant number, since it is smaller than the sum of its proper divisors (54946956).

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

31321044 is a wasteful number, since it uses less digits than its factorization.

31321044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637 (or 1632 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31321044 is about 5596.5207048666. The cubic root of 31321044 is about 315.2187747026.

Adding to 31321044 its reverse (44012313), we get a palindrome (75333357).

The spelling of 31321044 in words is "thirty-one million, three hundred twenty-one thousand, forty-four".