31130125 has 16 divisors (see below), whose sum is σ = 41841072. Its totient is φ = 22987200.

The previous prime is 31130101. The next prime is 31130147. The reversal of 31130125 is 52103113.

It can be written as a sum of positive squares in 8 ways, for example, as 24890121 + 6240004 = 4989^2 + 2498^2 .

It is not a de Polignac number, because 31130125 - 2⁹ = 31129613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31130099 and 31130108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7954 + ... + 11203.

It is an arithmetic number, because the mean of its divisors is an integer number (2615067).

Almost surely, 2^31130125 is an apocalyptic number.

It is an amenable number.

31130125 is a deficient number, since it is larger than the sum of its proper divisors (10710947).

31130125 is a wasteful number, since it uses less digits than its factorization.

31130125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19185 (or 19175 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 31130125 is about 5579.4376956822. The cubic root of 31130125 is about 314.5769916220.

Adding to 31130125 its reverse (52103113), we get a palindrome (83233238).

The spelling of 31130125 in words is "thirty-one million, one hundred thirty thousand, one hundred twenty-five".