206542551 has 8 divisors (see below), whose sum is σ = 276929280. Its totient is φ = 136925432.

The previous prime is 206542517. The next prime is 206542603. The reversal of 206542551 is 155245602.

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 206542551 - 2²¹ = 204445399 is a prime.

It is a super-3 number, since 3×206542551³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206542751) 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, 191775 + ... + 192848.

It is an arithmetic number, because the mean of its divisors is an integer number (34616160).

Almost surely, 2^206542551 is an apocalyptic number.

206542551 is a deficient number, since it is larger than the sum of its proper divisors (70386729).

206542551 is a wasteful number, since it uses less digits than its factorization.

206542551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384805.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 206542551 is about 14371.5883255818. The cubic root of 206542551 is about 591.1120947703.

The spelling of 206542551 in words is "two hundred six million, five hundred forty-two thousand, five hundred fifty-one".