31245313 has 4 divisors (see below), whose sum is σ = 34085808. Its totient is φ = 28404820.

The previous prime is 31245301. The next prime is 31245317. The reversal of 31245313 is 31354213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31354213 = 11 ⋅2850383.

It is a cyclic number.

It is not a de Polignac number, because 31245313 - 2⁵ = 31245281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31245317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1420231 + ... + 1420252.

It is an arithmetic number, because the mean of its divisors is an integer number (8521452).

Almost surely, 2^31245313 is an apocalyptic number.

It is an amenable number.

31245313 is a deficient number, since it is larger than the sum of its proper divisors (2840495).

31245313 is a wasteful number, since it uses less digits than its factorization.

31245313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840494.

The product of its digits is 1080, while the sum is 22.

The square root of 31245313 is about 5589.7507100049. The cubic root of 31245313 is about 314.9645143531.

Adding to 31245313 its reverse (31354213), we get a palindrome (62599526).

Subtracting 31245313 from its reverse (31354213), we obtain a square (108900 = 330²).

The spelling of 31245313 in words is "thirty-one million, two hundred forty-five thousand, three hundred thirteen".