57198221 has 2 divisors, whose sum is σ = 57198222. Its totient is φ = 57198220.

The previous prime is 57198209. The next prime is 57198223. The reversal of 57198221 is 12289175.

57198221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48846121 + 8352100 = 6989^2 + 2890^2 .

It is a cyclic number.

It is not a de Polignac number, because 57198221 - 2²² = 53003917 is a prime.

Together with 57198223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57198223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28599110 + 28599111.

It is an arithmetic number, because the mean of its divisors is an integer number (28599111).

Almost surely, 2^57198221 is an apocalyptic number.

It is an amenable number.

57198221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57198221 is an equidigital number, since it uses as much as digits as its factorization.

57198221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 57198221 is about 7562.9505485624. The cubic root of 57198221 is about 385.2957102955.

The spelling of 57198221 in words is "fifty-seven million, one hundred ninety-eight thousand, two hundred twenty-one".