2857091 has 4 divisors (see below), whose sum is σ = 2871792. Its totient is φ = 2842392.

The previous prime is 2857079. The next prime is 2857093. The reversal of 2857091 is 1907582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1907582 = 2 ⋅953791.

It is a cyclic number.

It is not a de Polignac number, because 2857091 - 2¹⁸ = 2594947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2857093) 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, 7055 + ... + 7448.

It is an arithmetic number, because the mean of its divisors is an integer number (717948).

2^2857091 is an apocalyptic number.

2857091 is a deficient number, since it is larger than the sum of its proper divisors (14701).

2857091 is a wasteful number, since it uses less digits than its factorization.

2857091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14700.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 2857091 is about 1690.2931698377. The cubic root of 2857091 is about 141.8974827069.

The spelling of 2857091 in words is "two million, eight hundred fifty-seven thousand, ninety-one".