57509321 has 2 divisors, whose sum is σ = 57509322. Its totient is φ = 57509320.

The previous prime is 57509281. The next prime is 57509377. The reversal of 57509321 is 12390575.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56851600 + 657721 = 7540^2 + 811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57509321 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (57500321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28754660 + 28754661.

It is an arithmetic number, because the mean of its divisors is an integer number (28754661).

Almost surely, 2^57509321 is an apocalyptic number.

It is an amenable number.

57509321 is a deficient number, since it is larger than the sum of its proper divisors (1).

57509321 is an equidigital number, since it uses as much as digits as its factorization.

57509321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 57509321 is about 7583.4900276851. The cubic root of 57509321 is about 385.9929862615.

Adding to 57509321 its reverse (12390575), we get a palindrome (69899896).

The spelling of 57509321 in words is "fifty-seven million, five hundred nine thousand, three hundred twenty-one".