57085409 has 4 divisors (see below), whose sum is σ = 57400980. Its totient is φ = 56769840.

The previous prime is 57085403. The next prime is 57085513. The reversal of 57085409 is 90458075.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2739025 + 54346384 = 1655^2 + 7372^2 .

It is a cyclic number.

It is not a de Polignac number, because 57085409 - 2⁴ = 57085393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57085403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157514 + ... + 157875.

It is an arithmetic number, because the mean of its divisors is an integer number (14350245).

Almost surely, 2^57085409 is an apocalyptic number.

It is an amenable number.

57085409 is a deficient number, since it is larger than the sum of its proper divisors (315571).

57085409 is a wasteful number, since it uses less digits than its factorization.

57085409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315570.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 57085409 is about 7555.4886671876. The cubic root of 57085409 is about 385.0422374530.

The spelling of 57085409 in words is "fifty-seven million, eighty-five thousand, four hundred nine".