57071791 has 4 divisors (see below), whose sum is σ = 65224912. Its totient is φ = 48918672.

The previous prime is 57071779. The next prime is 57071813. The reversal of 57071791 is 19717075.

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

It is a cyclic number.

It is not a de Polignac number, because 57071791 - 2⁵ = 57071759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57071791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57071711) 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, 4076550 + ... + 4076563.

It is an arithmetic number, because the mean of its divisors is an integer number (16306228).

Almost surely, 2^57071791 is an apocalyptic number.

57071791 is a deficient number, since it is larger than the sum of its proper divisors (8153121).

57071791 is an equidigital number, since it uses as much as digits as its factorization.

57071791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8153120.

The product of its (nonzero) digits is 15435, while the sum is 37.

The square root of 57071791 is about 7554.5874142801. The cubic root of 57071791 is about 385.0116171229.

It can be divided in two parts, 570 and 71791, that added together give a square (72361 = 269²).

The spelling of 57071791 in words is "fifty-seven million, seventy-one thousand, seven hundred ninety-one".