206604491 has 4 divisors (see below), whose sum is σ = 213269184. Its totient is φ = 199939800.

The previous prime is 206604473. The next prime is 206604523. The reversal of 206604491 is 194406602.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206604491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206604401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3332300 + ... + 3332361.

It is an arithmetic number, because the mean of its divisors is an integer number (53317296).

Almost surely, 2^206604491 is an apocalyptic number.

206604491 is a deficient number, since it is larger than the sum of its proper divisors (6664693).

206604491 is an equidigital number, since it uses as much as digits as its factorization.

206604491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6664692.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 206604491 is about 14373.7431102688. The cubic root of 206604491 is about 591.1711783564.

The spelling of 206604491 in words is "two hundred six million, six hundred four thousand, four hundred ninety-one".