57221897 has 2 divisors, whose sum is σ = 57221898. Its totient is φ = 57221896.

The previous prime is 57221893. The next prime is 57221971. The reversal of 57221897 is 79812275.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56866681 + 355216 = 7541^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 57221897 - 2² = 57221893 is a prime.

It is not a weakly prime, because it can be changed into another prime (57221891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28610948 + 28610949.

It is an arithmetic number, because the mean of its divisors is an integer number (28610949).

Almost surely, 2^57221897 is an apocalyptic number.

It is an amenable number.

57221897 is a deficient number, since it is larger than the sum of its proper divisors (1).

57221897 is an equidigital number, since it uses as much as digits as its factorization.

57221897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 41.

The square root of 57221897 is about 7564.5156487379. The cubic root of 57221897 is about 385.3488646461.

The spelling of 57221897 in words is "fifty-seven million, two hundred twenty-one thousand, eight hundred ninety-seven".