315745643 has 2 divisors, whose sum is σ = 315745644. Its totient is φ = 315745642.

The previous prime is 315745637. The next prime is 315745657. The reversal of 315745643 is 346547513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315745643 - 2¹⁰ = 315744619 is a prime.

It is a super-2 number, since 2×315745643² = 199390622146966898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315745597 and 315745606.

It is not a weakly prime, because it can be changed into another prime (315745673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157872821 + 157872822.

It is an arithmetic number, because the mean of its divisors is an integer number (157872822).

Almost surely, 2^315745643 is an apocalyptic number.

315745643 is a deficient number, since it is larger than the sum of its proper divisors (1).

315745643 is an equidigital number, since it uses as much as digits as its factorization.

315745643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 38.

The square root of 315745643 is about 17769.2330447884. The cubic root of 315745643 is about 680.9456587677.

The spelling of 315745643 in words is "three hundred fifteen million, seven hundred forty-five thousand, six hundred forty-three".