57865813 has 2 divisors, whose sum is σ = 57865814. Its totient is φ = 57865812.

The previous prime is 57865799. The next prime is 57865853. The reversal of 57865813 is 31856875.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32695524 + 25170289 = 5718^2 + 5017^2 .

It is a cyclic number.

It is not a de Polignac number, because 57865813 - 2¹³ = 57857621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57865813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57865853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28932906 + 28932907.

It is an arithmetic number, because the mean of its divisors is an integer number (28932907).

Almost surely, 2^57865813 is an apocalyptic number.

It is an amenable number.

57865813 is a deficient number, since it is larger than the sum of its proper divisors (1).

57865813 is an equidigital number, since it uses as much as digits as its factorization.

57865813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 43.

The square root of 57865813 is about 7606.9581962832. The cubic root of 57865813 is about 386.7889155503.

The spelling of 57865813 in words is "fifty-seven million, eight hundred sixty-five thousand, eight hundred thirteen".