31525225 has 12 divisors (see below), whose sum is σ = 41391324. Its totient is φ = 23736320.

The previous prime is 31525213. The next prime is 31525229. The reversal of 31525225 is 52252513.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 120409 + 31404816 = 347^2 + 5604^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31525225 is a prime.

It is a super-2 number, since 2×31525225² = 1987679622601250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31525225.

It is not an unprimeable number, because it can be changed into a prime (31525229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36664 + ... + 37513.

It is an arithmetic number, because the mean of its divisors is an integer number (3449277).

Almost surely, 2^31525225 is an apocalyptic number.

It is an amenable number.

31525225 is a deficient number, since it is larger than the sum of its proper divisors (9866099).

31525225 is a wasteful number, since it uses less digits than its factorization.

31525225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74204 (or 74199 counting only the distinct ones).

The product of its digits is 3000, while the sum is 25.

The square root of 31525225 is about 5614.7328520598. The cubic root of 31525225 is about 315.9022590678.

Adding to 31525225 its product of digits (3000), we get a square (31528225 = 5615²).

Adding to 31525225 its reverse (52252513), we get a palindrome (83777738).

The spelling of 31525225 in words is "thirty-one million, five hundred twenty-five thousand, two hundred twenty-five".