31421225 has 12 divisors (see below), whose sum is σ = 42504720. Its totient is φ = 22851600.

The previous prime is 31421213. The next prime is 31421233. The reversal of 31421225 is 52212413.

It is not a de Polignac number, because 31421225 - 2⁸ = 31420969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31421197 and 31421206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56855 + ... + 57404.

It is an arithmetic number, because the mean of its divisors is an integer number (3542060).

Almost surely, 2^31421225 is an apocalyptic number.

It is an amenable number.

31421225 is a deficient number, since it is larger than the sum of its proper divisors (11083495).

31421225 is a wasteful number, since it uses less digits than its factorization.

31421225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114280 (or 114275 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 31421225 is about 5605.4638523498. The cubic root of 31421225 is about 315.5544949205.

Adding to 31421225 its reverse (52212413), we get a palindrome (83633638).

The spelling of 31421225 in words is "thirty-one million, four hundred twenty-one thousand, two hundred twenty-five".