31143225 has 24 divisors (see below), whose sum is σ = 51733792. Its totient is φ = 16531200.

The previous prime is 31143199. The next prime is 31143239. The reversal of 31143225 is 52234113.

It is not a de Polignac number, because 31143225 - 2⁵ = 31143193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17214 + ... + 18936.

Almost surely, 2^31143225 is an apocalyptic number.

It is an amenable number.

31143225 is a deficient number, since it is larger than the sum of its proper divisors (20590567).

31143225 is a wasteful number, since it uses less digits than its factorization.

31143225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977 (or 1972 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 31143225 is about 5580.6115256305. The cubic root of 31143225 is about 314.6211115934.

Adding to 31143225 its reverse (52234113), we get a palindrome (83377338).

The spelling of 31143225 in words is "thirty-one million, one hundred forty-three thousand, two hundred twenty-five".