315057217 has 2 divisors, whose sum is σ = 315057218. Its totient is φ = 315057216.

The previous prime is 315057203. The next prime is 315057229. The reversal of 315057217 is 712750513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163865601 + 151191616 = 12801^2 + 12296^2 .

It is an emirp because it is prime and its reverse (712750513) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315057217 is a prime.

It is a super-2 number, since 2×315057217² = 198522099967570178, which contains 22 as substring.

It is equal to p_17022946 and since 315057217 and 17022946 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (315057287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157528608 + 157528609.

It is an arithmetic number, because the mean of its divisors is an integer number (157528609).

Almost surely, 2^315057217 is an apocalyptic number.

It is an amenable number.

315057217 is a deficient number, since it is larger than the sum of its proper divisors (1).

315057217 is an equidigital number, since it uses as much as digits as its factorization.

315057217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 315057217 is about 17749.8511824747. The cubic root of 315057217 is about 680.4504058990.

The spelling of 315057217 in words is "three hundred fifteen million, fifty-seven thousand, two hundred seventeen".