205522551 has 24 divisors (see below), whose sum is σ = 320269040. Its totient is φ = 126251136.

The previous prime is 205522523. The next prime is 205522561. The reversal of 205522551 is 155225502.

It is not a de Polignac number, because 205522551 - 2⁵ = 205522519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205522561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85275 + ... + 87651.

Almost surely, 2^205522551 is an apocalyptic number.

205522551 is a deficient number, since it is larger than the sum of its proper divisors (114746489).

205522551 is a wasteful number, since it uses less digits than its factorization.

205522551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135 (or 3132 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 27.

The square root of 205522551 is about 14336.0577217030. The cubic root of 205522551 is about 590.1374294433.

The spelling of 205522551 in words is "two hundred five million, five hundred twenty-two thousand, five hundred fifty-one".