31525242 has 64 divisors (see below), whose sum is σ = 77552640. Its totient is φ = 8338176.

The previous prime is 31525229. The next prime is 31525243. The reversal of 31525242 is 24252513.

It is not an unprimeable number, because it can be changed into a prime (31525243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47509 + ... + 48167.

It is an arithmetic number, because the mean of its divisors is an integer number (1211760).

Almost surely, 2^31525242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31525242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38776320).

31525242 is an abundant number, since it is smaller than the sum of its proper divisors (46027398).

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

31525242 is a wasteful number, since it uses less digits than its factorization.

31525242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755.

The product of its digits is 2400, while the sum is 24.

The square root of 31525242 is about 5614.7343659340. The cubic root of 31525242 is about 315.9023158513.

Adding to 31525242 its reverse (24252513), we get a palindrome (55777755).

The spelling of 31525242 in words is "thirty-one million, five hundred twenty-five thousand, two hundred forty-two".