2666591 has 2 divisors, whose sum is σ = 2666592. Its totient is φ = 2666590.

The previous prime is 2666581. The next prime is 2666633. The reversal of 2666591 is 1956662.

It is a happy number.

2666591 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 a de Polignac number, because none of the positive numbers 2^k-2666591 is a prime.

It is a super-2 number, since 2×2666591² = 14221415122562, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666561) 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, 1333295 + 1333296.

It is an arithmetic number, because the mean of its divisors is an integer number (1333296).

2^2666591 is an apocalyptic number.

2666591 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666591 is an equidigital number, since it uses as much as digits as its factorization.

2666591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 35.

The square root of 2666591 is about 1632.9699936006. The cubic root of 2666591 is about 138.6709432493.

The spelling of 2666591 in words is "two million, six hundred sixty-six thousand, five hundred ninety-one".