57081917 has 4 divisors (see below), whose sum is σ = 57184956. Its totient is φ = 56978880.

The previous prime is 57081911. The next prime is 57081961. The reversal of 57081917 is 71918075.

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 35450116 + 21631801 = 5954^2 + 4651^2 .

It is a cyclic number.

It is not a de Polignac number, because 57081917 - 2¹⁰ = 57080893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57081911) 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, 50684 + ... + 51797.

It is an arithmetic number, because the mean of its divisors is an integer number (14296239).

Almost surely, 2^57081917 is an apocalyptic number.

It is an amenable number.

57081917 is a deficient number, since it is larger than the sum of its proper divisors (103039).

57081917 is a wasteful number, since it uses less digits than its factorization.

57081917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103038.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 57081917 is about 7555.2575733723. The cubic root of 57081917 is about 385.0343860894.

The spelling of 57081917 in words is "fifty-seven million, eighty-one thousand, nine hundred seventeen".