315643 has 2 divisors, whose sum is σ = 315644. Its totient is φ = 315642.

The previous prime is 315631. The next prime is 315671. The reversal of 315643 is 346513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315643 - 2¹³ = 307451 is a prime.

It is not a weakly prime, because it can be changed into another prime (315613) 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 as a sum of consecutive naturals, namely, 157821 + 157822.

It is an arithmetic number, because the mean of its divisors is an integer number (157822).

2³¹⁵⁶⁴³ is an apocalyptic number.

315643 is a deficient number, since it is larger than the sum of its proper divisors (1).

315643 is an equidigital number, since it uses as much as digits as its factorization.

315643 is an odious number, because the sum of its binary digits is odd.

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

The square root of 315643 is about 561.8211459175. The cubic root of 315643 is about 68.0871863207.

The spelling of 315643 in words is "three hundred fifteen thousand, six hundred forty-three".