2261891 has 2 divisors, whose sum is σ = 2261892. Its totient is φ = 2261890.

The previous prime is 2261887. The next prime is 2261911. The reversal of 2261891 is 1981622.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2261891 - 2² = 2261887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2261801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1130945 + 1130946.

It is an arithmetic number, because the mean of its divisors is an integer number (1130946).

2^2261891 is an apocalyptic number.

2261891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2261891 is an equidigital number, since it uses as much as digits as its factorization.

2261891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 2261891 is about 1503.9584435748. The cubic root of 2261891 is about 131.2675030323.

The spelling of 2261891 in words is "two million, two hundred sixty-one thousand, eight hundred ninety-one".