206804891 has 4 divisors (see below), whose sum is σ = 215796432. Its totient is φ = 197813352.

The previous prime is 206804833. The next prime is 206804893. The reversal of 206804891 is 198408602.

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 206804891 - 2¹⁸ = 206542747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206804893) 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, 4495736 + ... + 4495781.

It is an arithmetic number, because the mean of its divisors is an integer number (53949108).

Almost surely, 2^206804891 is an apocalyptic number.

206804891 is a deficient number, since it is larger than the sum of its proper divisors (8991541).

206804891 is an equidigital number, since it uses as much as digits as its factorization.

206804891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8991540.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 206804891 is about 14380.7124649650. The cubic root of 206804891 is about 591.3622558750.

The spelling of 206804891 in words is "two hundred six million, eight hundred four thousand, eight hundred ninety-one".