31131125 has 16 divisors (see below), whose sum is σ = 39037440. Its totient is φ = 24786000.

The previous prime is 31131119. The next prime is 31131127. The reversal of 31131125 is 52113113.

It is not a de Polignac number, because 31131125 - 2¹⁰ = 31130101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33416 + ... + 34334.

It is an arithmetic number, because the mean of its divisors is an integer number (2439840).

Almost surely, 2^31131125 is an apocalyptic number.

It is an amenable number.

31131125 is a deficient number, since it is larger than the sum of its proper divisors (7906315).

31131125 is an equidigital number, since it uses as much as digits as its factorization.

31131125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205 (or 1195 counting only the distinct ones).

The product of its digits is 90, while the sum is 17.

The square root of 31131125 is about 5579.5273097279. The cubic root of 31131125 is about 314.5803599951.

Adding to 31131125 its reverse (52113113), we get a palindrome (83244238).

The spelling of 31131125 in words is "thirty-one million, one hundred thirty-one thousand, one hundred twenty-five".