315745657 has 2 divisors, whose sum is σ = 315745658. Its totient is φ = 315745656.

The previous prime is 315745643. The next prime is 315745669. The reversal of 315745657 is 756547513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312016896 + 3728761 = 17664^2 + 1931^2 .

It is an emirp because it is prime and its reverse (756547513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315745657 - 2¹⁵ = 315712889 is a prime.

It is not a weakly prime, because it can be changed into another prime (315745637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157872828 + 157872829.

It is an arithmetic number, because the mean of its divisors is an integer number (157872829).

Almost surely, 2^315745657 is an apocalyptic number.

It is an amenable number.

315745657 is a deficient number, since it is larger than the sum of its proper divisors (1).

315745657 is an equidigital number, since it uses as much as digits as its factorization.

315745657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 441000, while the sum is 43.

The square root of 315745657 is about 17769.2334387277. The cubic root of 315745657 is about 680.9456688319.

It can be divided in two parts, 3157456 and 57, that added together give a palindrome (3157513).

The spelling of 315745657 in words is "three hundred fifteen million, seven hundred forty-five thousand, six hundred fifty-seven".