57861509 has 2 divisors, whose sum is σ = 57861510. Its totient is φ = 57861508.

The previous prime is 57861499. The next prime is 57861511. The reversal of 57861509 is 90516875.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53949025 + 3912484 = 7345^2 + 1978^2 .

It is a cyclic number.

It is not a de Polignac number, because 57861509 - 2⁸ = 57861253 is a prime.

Together with 57861511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57861569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28930754 + 28930755.

It is an arithmetic number, because the mean of its divisors is an integer number (28930755).

Almost surely, 2^57861509 is an apocalyptic number.

It is an amenable number.

57861509 is a deficient number, since it is larger than the sum of its proper divisors (1).

57861509 is an equidigital number, since it uses as much as digits as its factorization.

57861509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 57861509 is about 7606.6752921365. The cubic root of 57861509 is about 386.7793256578.

The spelling of 57861509 in words is "fifty-seven million, eight hundred sixty-one thousand, five hundred nine".