31130285 has 8 divisors (see below), whose sum is σ = 37387896. Its totient is φ = 24883200.

The previous prime is 31130279. The next prime is 31130287. The reversal of 31130285 is 58203113.

It can be written as a sum of positive squares in 4 ways, for example, as 1471369 + 29658916 = 1213^2 + 5446^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31130285 - 2⁶ = 31130221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31130285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7277 + ... + 10733.

It is an arithmetic number, because the mean of its divisors is an integer number (4673487).

Almost surely, 2^31130285 is an apocalyptic number.

It is an amenable number.

31130285 is a deficient number, since it is larger than the sum of its proper divisors (6257611).

31130285 is a wasteful number, since it uses less digits than its factorization.

31130285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 31130285 is about 5579.4520340263. The cubic root of 31130285 is about 314.5775305666.

Adding to 31130285 its reverse (58203113), we get a palindrome (89333398).

The spelling of 31130285 in words is "thirty-one million, one hundred thirty thousand, two hundred eighty-five".