2691009 has 8 divisors (see below), whose sum is σ = 3986720. Its totient is φ = 1793988.

The previous prime is 2691001. The next prime is 2691011. The reversal of 2691009 is 9001962.

It is a happy number.

It is not a de Polignac number, because 2691009 - 2³ = 2691001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 99667 = 2691009 / (2 + 6 + 9 + 1 + 0 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2691001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49807 + ... + 49860.

It is an arithmetic number, because the mean of its divisors is an integer number (498340).

2^2691009 is an apocalyptic number.

It is an amenable number.

2691009 is a deficient number, since it is larger than the sum of its proper divisors (1295711).

2691009 is an equidigital number, since it uses as much as digits as its factorization.

2691009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99676 (or 99670 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 2691009 is about 1640.4295169254. The cubic root of 2691009 is about 139.0929282151.

The spelling of 2691009 in words is "two million, six hundred ninety-one thousand, nine".