205273551 has 16 divisors (see below), whose sum is σ = 326398464. Its totient is φ = 112198944.

The previous prime is 205273531. The next prime is 205273583. The reversal of 205273551 is 155372502.

It is not a de Polignac number, because 205273551 - 2⁷ = 205273423 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205273501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212016 + ... + 212981.

It is an arithmetic number, because the mean of its divisors is an integer number (20399904).

Almost surely, 2^205273551 is an apocalyptic number.

205273551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

205273551 is a deficient number, since it is larger than the sum of its proper divisors (121124913).

205273551 is a wasteful number, since it uses less digits than its factorization.

205273551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425030.

The product of its (nonzero) digits is 10500, while the sum is 30.

The square root of 205273551 is about 14327.3706938852. The cubic root of 205273551 is about 589.8990069403.

The spelling of 205273551 in words is "two hundred five million, two hundred seventy-three thousand, five hundred fifty-one".