57990221 has 2 divisors, whose sum is σ = 57990222. Its totient is φ = 57990220.

The previous prime is 57990217. The next prime is 57990239. The reversal of 57990221 is 12209975.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56400100 + 1590121 = 7510^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 57990221 - 2² = 57990217 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57990421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28995110 + 28995111.

It is an arithmetic number, because the mean of its divisors is an integer number (28995111).

Almost surely, 2^57990221 is an apocalyptic number.

It is an amenable number.

57990221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57990221 is an equidigital number, since it uses as much as digits as its factorization.

57990221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 57990221 is about 7615.1310559963. The cubic root of 57990221 is about 387.0659080684.

The spelling of 57990221 in words is "fifty-seven million, nine hundred ninety thousand, two hundred twenty-one".