57611321 has 2 divisors, whose sum is σ = 57611322. Its totient is φ = 57611320.

The previous prime is 57611219. The next prime is 57611327. The reversal of 57611321 is 12311675.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36772096 + 20839225 = 6064^2 + 4565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57611321 is a prime.

It is not a weakly prime, because it can be changed into another prime (57611327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28805660 + 28805661.

It is an arithmetic number, because the mean of its divisors is an integer number (28805661).

Almost surely, 2^57611321 is an apocalyptic number.

It is an amenable number.

57611321 is a deficient number, since it is larger than the sum of its proper divisors (1).

57611321 is an equidigital number, since it uses as much as digits as its factorization.

57611321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 26.

The square root of 57611321 is about 7590.2121841224. The cubic root of 57611321 is about 386.2210538175.

Adding to 57611321 its reverse (12311675), we get a palindrome (69922996).

The spelling of 57611321 in words is "fifty-seven million, six hundred eleven thousand, three hundred twenty-one".