2689691 has 2 divisors, whose sum is σ = 2689692. Its totient is φ = 2689690.

The previous prime is 2689679. The next prime is 2689699. The reversal of 2689691 is 1969862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2689691 - 2¹⁰ = 2688667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2689699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344845 + 1344846.

It is an arithmetic number, because the mean of its divisors is an integer number (1344846).

2^2689691 is an apocalyptic number.

2689691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2689691 is an equidigital number, since it uses as much as digits as its factorization.

2689691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 2689691 is about 1640.0277436678. The cubic root of 2689691 is about 139.0702162364.

The spelling of 2689691 in words is "two million, six hundred eighty-nine thousand, six hundred ninety-one".