2891009 has 4 divisors (see below), whose sum is σ = 3153840. Its totient is φ = 2628180.

The previous prime is 2890999. The next prime is 2891011. The reversal of 2891009 is 9001982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2891009 - 2⁸ = 2890753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2891509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131399 + ... + 131420.

It is an arithmetic number, because the mean of its divisors is an integer number (788460).

2^2891009 is an apocalyptic number.

It is an amenable number.

2891009 is a deficient number, since it is larger than the sum of its proper divisors (262831).

2891009 is a wasteful number, since it uses less digits than its factorization.

2891009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262830.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 2891009 is about 1700.2967388077. The cubic root of 2891009 is about 142.4567879646.

The spelling of 2891009 in words is "two million, eight hundred ninety-one thousand, nine".