205422155 has 4 divisors (see below), whose sum is σ = 246506592. Its totient is φ = 164337720.

The previous prime is 205422143. The next prime is 205422193. The reversal of 205422155 is 551224502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551224502 = 2 ⋅275612251.

It is not a de Polignac number, because 205422155 - 2¹⁰ = 205421131 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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20542211 + ... + 20542220.

It is an arithmetic number, because the mean of its divisors is an integer number (61626648).

Almost surely, 2^205422155 is an apocalyptic number.

205422155 is a deficient number, since it is larger than the sum of its proper divisors (41084437).

205422155 is an equidigital number, since it uses as much as digits as its factorization.

205422155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41084436.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 205422155 is about 14332.5557734830. Note that the first 3 decimals coincide. The cubic root of 205422155 is about 590.0413214380.

Adding to 205422155 its reverse (551224502), we get a palindrome (756646657).

The spelling of 205422155 in words is "two hundred five million, four hundred twenty-two thousand, one hundred fifty-five".