205211455 has 8 divisors (see below), whose sum is σ = 246524400. Its totient is φ = 163988736.

The previous prime is 205211449. The next prime is 205211459. The reversal of 205211455 is 554112502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205211455 - 2⁵ = 205211423 is a prime.

It is a super-2 number, since 2×205211455² = 84223482526434050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205211459) 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 7 ways as a sum of consecutive naturals, for example, 17445 + ... + 26734.

It is an arithmetic number, because the mean of its divisors is an integer number (30815550).

Almost surely, 2^205211455 is an apocalyptic number.

205211455 is a deficient number, since it is larger than the sum of its proper divisors (41312945).

205211455 is an equidigital number, since it uses as much as digits as its factorization.

205211455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45113.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 205211455 is about 14325.2034889561. The cubic root of 205211455 is about 589.8395187390.

Adding to 205211455 its reverse (554112502), we get a palindrome (759323957).

The spelling of 205211455 in words is "two hundred five million, two hundred eleven thousand, four hundred fifty-five".