2669991 has 4 divisors (see below), whose sum is σ = 3559992. Its totient is φ = 1779992.

The previous prime is 2669987. The next prime is 2670011. The reversal of 2669991 is 1999662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2669991 - 2² = 2669987 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2669951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444996 + ... + 445001.

It is an arithmetic number, because the mean of its divisors is an integer number (889998).

2^2669991 is an apocalyptic number.

2669991 is a deficient number, since it is larger than the sum of its proper divisors (890001).

2669991 is an equidigital number, since it uses as much as digits as its factorization.

2669991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890000.

The product of its digits is 52488, while the sum is 42.

The square root of 2669991 is about 1634.0107098792. The cubic root of 2669991 is about 138.7298550414.

The spelling of 2669991 in words is "two million, six hundred sixty-nine thousand, nine hundred ninety-one".