206699491 has 4 divisors (see below), whose sum is σ = 211740984. Its totient is φ = 201658000.

The previous prime is 206699483. The next prime is 206699513. The reversal of 206699491 is 194996602.

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 206699491 - 2³ = 206699483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206699431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2520685 + ... + 2520766.

It is an arithmetic number, because the mean of its divisors is an integer number (52935246).

Almost surely, 2^206699491 is an apocalyptic number.

206699491 is a deficient number, since it is larger than the sum of its proper divisors (5041493).

206699491 is an equidigital number, since it uses as much as digits as its factorization.

206699491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041492.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 206699491 is about 14377.0473672448. The cubic root of 206699491 is about 591.2617744125.

The spelling of 206699491 in words is "two hundred six million, six hundred ninety-nine thousand, four hundred ninety-one".