27831313 has 4 divisors (see below), whose sum is σ = 27850788. Its totient is φ = 27811840.

The previous prime is 27831281. The next prime is 27831317. The reversal of 27831313 is 31313872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1329409 + 26501904 = 1153^2 + 5148^2 .

It is a cyclic number.

It is not a de Polignac number, because 27831313 - 2⁵ = 27831281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27831317) 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, 7408 + ... + 10513.

It is an arithmetic number, because the mean of its divisors is an integer number (6962697).

Almost surely, 2^27831313 is an apocalyptic number.

It is an amenable number.

27831313 is a deficient number, since it is larger than the sum of its proper divisors (19475).

27831313 is a wasteful number, since it uses less digits than its factorization.

27831313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19474.

The product of its digits is 3024, while the sum is 28.

The square root of 27831313 is about 5275.5391193697. The cubic root of 27831313 is about 303.0478671921.

It can be divided in two parts, 2783 and 1313, that added together give a 12-th power (4096 = 2¹²).

The spelling of 27831313 in words is "twenty-seven million, eight hundred thirty-one thousand, three hundred thirteen".