31223225 has 12 divisors (see below), whose sum is σ = 42236880. Its totient is φ = 22707600.

The previous prime is 31223219. The next prime is 31223239. The reversal of 31223225 is 52232213.

It is not a de Polignac number, because 31223225 - 2⁴ = 31223209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31223197 and 31223206.

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, 56495 + ... + 57044.

It is an arithmetic number, because the mean of its divisors is an integer number (3519740).

Almost surely, 2^31223225 is an apocalyptic number.

It is an amenable number.

31223225 is a deficient number, since it is larger than the sum of its proper divisors (11013655).

31223225 is a wasteful number, since it uses less digits than its factorization.

31223225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113560 (or 113555 counting only the distinct ones).

The product of its digits is 720, while the sum is 20.

The square root of 31223225 is about 5587.7746017534. The cubic root of 31223225 is about 314.8902784064.

Adding to 31223225 its reverse (52232213), we get a palindrome (83455438).

The spelling of 31223225 in words is "thirty-one million, two hundred twenty-three thousand, two hundred twenty-five".