57081613 has 2 divisors, whose sum is σ = 57081614. Its totient is φ = 57081612.

The previous prime is 57081593. The next prime is 57081617. The reversal of 57081613 is 31618075.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46758244 + 10323369 = 6838^2 + 3213^2 .

It is a cyclic number.

It is not a de Polignac number, because 57081613 - 2¹⁷ = 56950541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57081617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28540806 + 28540807.

It is an arithmetic number, because the mean of its divisors is an integer number (28540807).

Almost surely, 2^57081613 is an apocalyptic number.

It is an amenable number.

57081613 is a deficient number, since it is larger than the sum of its proper divisors (1).

57081613 is an equidigital number, since it uses as much as digits as its factorization.

57081613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 57081613 is about 7555.2374549050. The cubic root of 57081613 is about 385.0337025649.

Adding to 57081613 its reverse (31618075), we get a palindrome (88699688).

The spelling of 57081613 in words is "fifty-seven million, eighty-one thousand, six hundred thirteen".