205535551 has 8 divisors (see below), whose sum is σ = 223416144. Its totient is φ = 187950720.

The previous prime is 205535513. The next prime is 205535563. The reversal of 205535551 is 155535502.

It is a happy number.

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 205535551 - 2¹⁹ = 205011263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205535051) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 72490 + ... + 75271.

It is an arithmetic number, because the mean of its divisors is an integer number (27927018).

Almost surely, 2^205535551 is an apocalyptic number.

205535551 is a deficient number, since it is larger than the sum of its proper divisors (17880593).

205535551 is a wasteful number, since it uses less digits than its factorization.

205535551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147881.

The product of its (nonzero) digits is 18750, while the sum is 31.

The square root of 205535551 is about 14336.5111167257. The cubic root of 205535551 is about 590.1498719138.

The spelling of 205535551 in words is "two hundred five million, five hundred thirty-five thousand, five hundred fifty-one".