31130245 has 4 divisors (see below), whose sum is σ = 37356300. Its totient is φ = 24904192.

The previous prime is 31130243. The next prime is 31130251. The reversal of 31130245 is 54203113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54203113 = 37 ⋅1464949.

It can be written as a sum of positive squares in 2 ways, for example, as 24581764 + 6548481 = 4958^2 + 2559^2 .

It is a cyclic number.

It is not a de Polignac number, because 31130245 - 2¹ = 31130243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31130243) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3113020 + ... + 3113029.

It is an arithmetic number, because the mean of its divisors is an integer number (9339075).

Almost surely, 2^31130245 is an apocalyptic number.

It is an amenable number.

31130245 is a deficient number, since it is larger than the sum of its proper divisors (6226055).

31130245 is an equidigital number, since it uses as much as digits as its factorization.

31130245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226054.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 31130245 is about 5579.4484494437. The cubic root of 31130245 is about 314.5773958306.

Adding to 31130245 its reverse (54203113), we get a palindrome (85333358).

It can be divided in two parts, 31130 and 245, that added together give a triangular number (31375 = T₂₅₀).

The spelling of 31130245 in words is "thirty-one million, one hundred thirty thousand, two hundred forty-five".