206481155 has 4 divisors (see below), whose sum is σ = 247777392. Its totient is φ = 165184920.

The previous prime is 206481137. The next prime is 206481229. The reversal of 206481155 is 551184602.

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

It is not a de Polignac number, because 206481155 - 2⁶ = 206481091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20648111 + ... + 20648120.

It is an arithmetic number, because the mean of its divisors is an integer number (61944348).

Almost surely, 2^206481155 is an apocalyptic number.

206481155 is a deficient number, since it is larger than the sum of its proper divisors (41296237).

206481155 is an equidigital number, since it uses as much as digits as its factorization.

206481155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41296236.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 206481155 is about 14369.4521468287. The cubic root of 206481155 is about 591.0535184389.

The spelling of 206481155 in words is "two hundred six million, four hundred eighty-one thousand, one hundred fifty-five".