57171217 has 2 divisors, whose sum is σ = 57171218. Its totient is φ = 57171216.

The previous prime is 57171181. The next prime is 57171227. The reversal of 57171217 is 71217175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49575681 + 7595536 = 7041^2 + 2756^2 .

It is a cyclic number.

It is not a de Polignac number, because 57171217 - 2⁷ = 57171089 is a prime.

It is a super-2 number, since 2×57171217² = 6537096106522178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (57171227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28585608 + 28585609.

It is an arithmetic number, because the mean of its divisors is an integer number (28585609).

Almost surely, 2^57171217 is an apocalyptic number.

It is an amenable number.

57171217 is a deficient number, since it is larger than the sum of its proper divisors (1).

57171217 is an equidigital number, since it uses as much as digits as its factorization.

57171217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3430, while the sum is 31.

The square root of 57171217 is about 7561.1650557305. The cubic root of 57171217 is about 385.2350664329.

The spelling of 57171217 in words is "fifty-seven million, one hundred seventy-one thousand, two hundred seventeen".