206554391 has 2 divisors, whose sum is σ = 206554392. Its totient is φ = 206554390.

The previous prime is 206554363. The next prime is 206554399. The reversal of 206554391 is 193455602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206554391 - 2²² = 202360087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206554399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103277195 + 103277196.

It is an arithmetic number, because the mean of its divisors is an integer number (103277196).

Almost surely, 2^206554391 is an apocalyptic number.

206554391 is a deficient number, since it is larger than the sum of its proper divisors (1).

206554391 is an equidigital number, since it uses as much as digits as its factorization.

206554391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 206554391 is about 14372.0002435291. Note that the first 3 decimals coincide. The cubic root of 206554391 is about 591.1233896721.

The spelling of 206554391 in words is "two hundred six million, five hundred fifty-four thousand, three hundred ninety-one".