31225649 has 16 divisors (see below), whose sum is σ = 39674880. Its totient is φ = 23906880.

The previous prime is 31225643. The next prime is 31225657. The reversal of 31225649 is 94652213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31225649 - 2⁴ = 31225633 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (31225643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2714 + ... + 8355.

It is an arithmetic number, because the mean of its divisors is an integer number (2479680).

Almost surely, 2^31225649 is an apocalyptic number.

It is an amenable number.

31225649 is a deficient number, since it is larger than the sum of its proper divisors (8449231).

31225649 is a wasteful number, since it uses less digits than its factorization.

31225649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120.

The product of its digits is 12960, while the sum is 32.

The square root of 31225649 is about 5587.9914996356. The cubic root of 31225649 is about 314.8984269805.

The spelling of 31225649 in words is "thirty-one million, two hundred twenty-five thousand, six hundred forty-nine".