57218173 has 2 divisors, whose sum is σ = 57218174. Its totient is φ = 57218172.

The previous prime is 57218167. The next prime is 57218191. The reversal of 57218173 is 37181275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44063044 + 13155129 = 6638^2 + 3627^2 .

It is a cyclic number.

It is not a de Polignac number, because 57218173 - 2²⁵ = 23663741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57218113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28609086 + 28609087.

It is an arithmetic number, because the mean of its divisors is an integer number (28609087).

Almost surely, 2^57218173 is an apocalyptic number.

It is an amenable number.

57218173 is a deficient number, since it is larger than the sum of its proper divisors (1).

57218173 is an equidigital number, since it uses as much as digits as its factorization.

57218173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11760, while the sum is 34.

The square root of 57218173 is about 7564.2694954635. The cubic root of 57218173 is about 385.3405049657.

The spelling of 57218173 in words is "fifty-seven million, two hundred eighteen thousand, one hundred seventy-three".