2659691 has 2 divisors, whose sum is σ = 2659692. Its totient is φ = 2659690.

The previous prime is 2659687. The next prime is 2659717. The reversal of 2659691 is 1969562.

2659691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2659691 - 2² = 2659687 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2659621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1329845 + 1329846.

It is an arithmetic number, because the mean of its divisors is an integer number (1329846).

2^2659691 is an apocalyptic number.

2659691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2659691 is an equidigital number, since it uses as much as digits as its factorization.

2659691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29160, while the sum is 38.

The square root of 2659691 is about 1630.8559102508. The cubic root of 2659691 is about 138.5512328543.

The spelling of 2659691 in words is "two million, six hundred fifty-nine thousand, six hundred ninety-one".