57302221 has 2 divisors, whose sum is σ = 57302222. Its totient is φ = 57302220.

The previous prime is 57302213. The next prime is 57302227. The reversal of 57302221 is 12220375.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 3279721 = 7350^2 + 1811^2 .

It is a cyclic number.

It is not a de Polignac number, because 57302221 - 2³ = 57302213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 57302192 and 57302201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57302227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28651110 + 28651111.

It is an arithmetic number, because the mean of its divisors is an integer number (28651111).

Almost surely, 2^57302221 is an apocalyptic number.

It is an amenable number.

57302221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57302221 is an equidigital number, since it uses as much as digits as its factorization.

57302221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 57302221 is about 7569.8230494510. The cubic root of 57302221 is about 385.5290887212.

Adding to 57302221 its reverse (12220375), we get a palindrome (69522596).

The spelling of 57302221 in words is "fifty-seven million, three hundred two thousand, two hundred twenty-one".