31878125 has 18 divisors (see below), whose sum is σ = 40243518. Its totient is φ = 25250000.

The previous prime is 31878101. The next prime is 31878139. The reversal of 31878125 is 52187813.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 9 ways, for example, as 20994724 + 10883401 = 4582^2 + 3299^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31878125 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 315575 + ... + 315675.

It is an arithmetic number, because the mean of its divisors is an integer number (2235751).

Almost surely, 2^31878125 is an apocalyptic number.

It is an amenable number.

31878125 is a deficient number, since it is larger than the sum of its proper divisors (8365393).

31878125 is an frugal number, since it uses more digits than its factorization.

31878125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 106 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 31878125 is about 5646.0716431870. The cubic root of 31878125 is about 317.0766465740.

The spelling of 31878125 in words is "thirty-one million, eight hundred seventy-eight thousand, one hundred twenty-five".