206120551 has 16 divisors (see below), whose sum is σ = 258479424. Its totient is φ = 160003584.

The previous prime is 206120539. The next prime is 206120561. The reversal of 206120551 is 155021602.

It is not a de Polignac number, because 206120551 - 2⁷ = 206120423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206120561) 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 15 ways as a sum of consecutive naturals, for example, 16546 + ... + 26191.

It is an arithmetic number, because the mean of its divisors is an integer number (16154964).

Almost surely, 2^206120551 is an apocalyptic number.

206120551 is a deficient number, since it is larger than the sum of its proper divisors (52358873).

206120551 is a wasteful number, since it uses less digits than its factorization.

206120551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42810.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 206120551 is about 14356.8990732679. The cubic root of 206120551 is about 590.7092409203.

The spelling of 206120551 in words is "two hundred six million, one hundred twenty thousand, five hundred fifty-one".