31028125 has 12 divisors (see below), whose sum is σ = 38786580. Its totient is φ = 24820000.

The previous prime is 31028093. The next prime is 31028143. The reversal of 31028125 is 52182013.

It can be written as a sum of positive squares in 6 ways, for example, as 28751044 + 2277081 = 5362^2 + 1509^2 .

It is not a de Polignac number, because 31028125 - 2⁵ = 31028093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31028096 and 31028105.

It is a congruent number.

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, 1840 + ... + 8089.

It is an arithmetic number, because the mean of its divisors is an integer number (3232215).

Almost surely, 2^31028125 is an apocalyptic number.

It is an amenable number.

31028125 is a deficient number, since it is larger than the sum of its proper divisors (7758455).

31028125 is an frugal number, since it uses more digits than its factorization.

31028125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9954 (or 9934 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 31028125 is about 5570.2894897842. The cubic root of 31028125 is about 314.2330379544.

The spelling of 31028125 in words is "thirty-one million, twenty-eight thousand, one hundred twenty-five".