31642225 has 12 divisors (see below), whose sum is σ = 39881500. Its totient is φ = 24897600.

The previous prime is 31642217. The next prime is 31642229. The reversal of 31642225 is 52224613.

It can be written as a sum of positive squares in 6 ways, for example, as 14799409 + 16842816 = 3847^2 + 4104^2 .

It is not a de Polignac number, because 31642225 - 2³ = 31642217 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 31642225.

It is not an unprimeable number, because it can be changed into a prime (31642229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8850 + ... + 11899.

Almost surely, 2^31642225 is an apocalyptic number.

It is an amenable number.

31642225 is a deficient number, since it is larger than the sum of its proper divisors (8239275).

31642225 is a wasteful number, since it uses less digits than its factorization.

31642225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20820 (or 20815 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 31642225 is about 5625.1422204243. The cubic root of 31642225 is about 316.2925807258.

Adding to 31642225 its reverse (52224613), we get a palindrome (83866838).

The spelling of 31642225 in words is "thirty-one million, six hundred forty-two thousand, two hundred twenty-five".