2689891 has 2 divisors, whose sum is σ = 2689892. Its totient is φ = 2689890.

The previous prime is 2689889. The next prime is 2689903. The reversal of 2689891 is 1989862.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2689891 - 2¹ = 2689889 is a prime.

Together with 2689889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2689861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344945 + 1344946.

It is an arithmetic number, because the mean of its divisors is an integer number (1344946).

2^2689891 is an apocalyptic number.

2689891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2689891 is an equidigital number, since it uses as much as digits as its factorization.

2689891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 43.

The square root of 2689891 is about 1640.0887171126. The cubic root of 2689891 is about 139.0736631446.

The spelling of 2689891 in words is "two million, six hundred eighty-nine thousand, eight hundred ninety-one".