206491073 has 4 divisors (see below), whose sum is σ = 206522160. Its totient is φ = 206459988.

The previous prime is 206491067. The next prime is 206491123. The reversal of 206491073 is 370194602.

206491073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 370194602 = 2 ⋅185097301.

It is a cyclic number.

It is not a de Polignac number, because 206491073 - 2⁶ = 206491009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206491063) 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, 1115 + ... + 20352.

It is an arithmetic number, because the mean of its divisors is an integer number (51630540).

Almost surely, 2^206491073 is an apocalyptic number.

It is an amenable number.

206491073 is a deficient number, since it is larger than the sum of its proper divisors (31087).

206491073 is an equidigital number, since it uses as much as digits as its factorization.

206491073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31086.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 206491073 is about 14369.7972497875. The cubic root of 206491073 is about 591.0629817318.

The spelling of 206491073 in words is "two hundred six million, four hundred ninety-one thousand, seventy-three".