31143125 has 20 divisors (see below), whose sum is σ = 41920956. Its totient is φ = 22992000.

The previous prime is 31143113. The next prime is 31143157. The reversal of 31143125 is 52134113.

It can be written as a sum of positive squares in 10 ways, for example, as 30393169 + 749956 = 5513^2 + 866^2 .

It is not a de Polignac number, because 31143125 - 2⁶ = 31143061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31143097 and 31143106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6209 + ... + 10041.

Almost surely, 2^31143125 is an apocalyptic number.

It is an amenable number.

31143125 is a deficient number, since it is larger than the sum of its proper divisors (10777831).

31143125 is an equidigital number, since it uses as much as digits as its factorization.

31143125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3866 (or 3851 counting only the distinct ones).

The product of its digits is 360, while the sum is 20.

The square root of 31143125 is about 5580.6025660317. The cubic root of 31143125 is about 314.6207748466.

Adding to 31143125 its reverse (52134113), we get a palindrome (83277238).

The spelling of 31143125 in words is "thirty-one million, one hundred forty-three thousand, one hundred twenty-five".