315247 has 2 divisors, whose sum is σ = 315248. Its totient is φ = 315246.

The previous prime is 315223. The next prime is 315251. The reversal of 315247 is 742513.

It is a strong prime.

It is an emirp because it is prime and its reverse (742513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315257) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157623 + 157624.

It is an arithmetic number, because the mean of its divisors is an integer number (157624).

2³¹⁵²⁴⁷ is an apocalyptic number.

315247 is a deficient number, since it is larger than the sum of its proper divisors (1).

315247 is an equidigital number, since it uses as much as digits as its factorization.

315247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 22.

The square root of 315247 is about 561.4686099863. The cubic root of 315247 is about 68.0587007540.

The spelling of 315247 in words is "three hundred fifteen thousand, two hundred forty-seven".