2209004891 has 4 divisors (see below), whose sum is σ = 2210983632. Its totient is φ = 2207026152.

The previous prime is 2209004879. The next prime is 2209004909. The reversal of 2209004891 is 1984009022.

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 2209004891 - 2²⁶ = 2141896027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2239004891) 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, 987695 + ... + 989928.

It is an arithmetic number, because the mean of its divisors is an integer number (552745908).

Almost surely, 2^2209004891 is an apocalyptic number.

2209004891 is a deficient number, since it is larger than the sum of its proper divisors (1978741).

2209004891 is a wasteful number, since it uses less digits than its factorization.

2209004891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978740.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 2209004891 is about 47000.0520318861. The cubic root of 2209004891 is about 1302.3635288656.

The spelling of 2209004891 in words is "two billion, two hundred nine million, four thousand, eight hundred ninety-one".