57221191 has 2 divisors, whose sum is σ = 57221192. Its totient is φ = 57221190.

The previous prime is 57221183. The next prime is 57221207. The reversal of 57221191 is 19112275.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57221191 - 2³ = 57221183 is a prime.

It is a congruent number.

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, 28610595 + 28610596.

It is an arithmetic number, because the mean of its divisors is an integer number (28610596).

Almost surely, 2^57221191 is an apocalyptic number.

57221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

57221191 is an equidigital number, since it uses as much as digits as its factorization.

57221191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 57221191 is about 7564.4689833458. The cubic root of 57221191 is about 385.3472798366.

The spelling of 57221191 in words is "fifty-seven million, two hundred twenty-one thousand, one hundred ninety-one".