31408225 has 12 divisors (see below), whose sum is σ = 40640256. Its totient is φ = 24033680.

The previous prime is 31408219. The next prime is 31408253. The reversal of 31408225 is 52280413.

It is not a de Polignac number, because 31408225 - 2¹⁵ = 31375457 is a prime.

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 31408225.

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, 26737 + ... + 27886.

It is an arithmetic number, because the mean of its divisors is an integer number (3386688).

Almost surely, 2^31408225 is an apocalyptic number.

It is an amenable number.

31408225 is a deficient number, since it is larger than the sum of its proper divisors (9232031).

31408225 is a wasteful number, since it uses less digits than its factorization.

31408225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54656 (or 54651 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 31408225 is about 5604.3041494908. The cubic root of 31408225 is about 315.5109704737.

Adding to 31408225 its reverse (52280413), we get a palindrome (83688638).

The spelling of 31408225 in words is "thirty-one million, four hundred eight thousand, two hundred twenty-five".