206273551 has 4 divisors (see below), whose sum is σ = 225025704. Its totient is φ = 187521400.

The previous prime is 206273539. The next prime is 206273567. The reversal of 206273551 is 155372602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 206273551 - 2¹¹ = 206271503 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206223551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9376060 + ... + 9376081.

It is an arithmetic number, because the mean of its divisors is an integer number (56256426).

Almost surely, 2^206273551 is an apocalyptic number.

206273551 is a deficient number, since it is larger than the sum of its proper divisors (18752153).

206273551 is a wasteful number, since it uses less digits than its factorization.

206273551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18752152.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 206273551 is about 14362.2265335149. The cubic root of 206273551 is about 590.8553627900.

The spelling of 206273551 in words is "two hundred six million, two hundred seventy-three thousand, five hundred fifty-one".