2664691 has 2 divisors, whose sum is σ = 2664692. Its totient is φ = 2664690.

The previous prime is 2664689. The next prime is 2664707. The reversal of 2664691 is 1964662.

2664691 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 2664691 - 2¹ = 2664689 is a prime.

Together with 2664689, it forms a pair of twin primes.

2664691 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2664601) 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, 1332345 + 1332346.

It is an arithmetic number, because the mean of its divisors is an integer number (1332346).

2^2664691 is an apocalyptic number.

2664691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2664691 is an equidigital number, since it uses as much as digits as its factorization.

2664691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 2664691 is about 1632.3881278667. The cubic root of 2664691 is about 138.6380001403.

The spelling of 2664691 in words is "two million, six hundred sixty-four thousand, six hundred ninety-one".