31125204 has 72 divisors (see below), whose sum is σ = 87508512. Its totient is φ = 9247680.

The previous prime is 31125203. The next prime is 31125217. The reversal of 31125204 is 40252113.

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 (31125203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20247 + ... + 21729.

It is an arithmetic number, because the mean of its divisors is an integer number (1215396).

Almost surely, 2^31125204 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 31125204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43754256).

31125204 is an abundant number, since it is smaller than the sum of its proper divisors (56383308).

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

31125204 is a wasteful number, since it uses less digits than its factorization.

31125204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557 (or 1552 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31125204 is about 5578.9966839926. The cubic root of 31125204 is about 314.5604148072.

Adding to 31125204 its reverse (40252113), we get a palindrome (71377317).

It can be divided in two parts, 31125 and 204, that added together give a square (31329 = 177²).

The spelling of 31125204 in words is "thirty-one million, one hundred twenty-five thousand, two hundred four".