31131044 has 48 divisors (see below), whose sum is σ = 66124800. Its totient is φ = 12527136.

The previous prime is 31131041. The next prime is 31131053. The reversal of 31131044 is 44013113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131041) 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, 86537 + ... + 86895.

It is an arithmetic number, because the mean of its divisors is an integer number (1377600).

Almost surely, 2^31131044 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 31131044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33062400).

31131044 is an abundant number, since it is smaller than the sum of its proper divisors (34993756).

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

31131044 is a wasteful number, since it uses less digits than its factorization.

31131044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 31131044 is about 5579.5200510438. The cubic root of 31131044 is about 314.5800871596.

Adding to 31131044 its reverse (44013113), we get a palindrome (75144157).

The spelling of 31131044 in words is "thirty-one million, one hundred thirty-one thousand, forty-four".