2611891 has 4 divisors (see below), whose sum is σ = 2622312. Its totient is φ = 2601472.

The previous prime is 2611879. The next prime is 2611901. The reversal of 2611891 is 1981162.

It is a happy number.

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 2611891 - 2⁵ = 2611859 is a prime.

It is a Duffinian number.

2611891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2611801) 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, 4825 + ... + 5338.

It is an arithmetic number, because the mean of its divisors is an integer number (655578).

2^2611891 is an apocalyptic number.

2611891 is a deficient number, since it is larger than the sum of its proper divisors (10421).

2611891 is a wasteful number, since it uses less digits than its factorization.

2611891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10420.

The product of its digits is 864, while the sum is 28.

The square root of 2611891 is about 1616.1345859798. The cubic root of 2611891 is about 137.7161954284.

The spelling of 2611891 in words is "two million, six hundred eleven thousand, eight hundred ninety-one".