205116551 has 2 divisors, whose sum is σ = 205116552. Its totient is φ = 205116550.

The previous prime is 205116521. The next prime is 205116559. The reversal of 205116551 is 155611502.

205116551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205116551 - 2⁶ = 205116487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205116551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205116559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102558275 + 102558276.

It is an arithmetic number, because the mean of its divisors is an integer number (102558276).

Almost surely, 2^205116551 is an apocalyptic number.

205116551 is a deficient number, since it is larger than the sum of its proper divisors (1).

205116551 is an equidigital number, since it uses as much as digits as its factorization.

205116551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 205116551 is about 14321.8906224004. The cubic root of 205116551 is about 589.7485771599.

The spelling of 205116551 in words is "two hundred five million, one hundred sixteen thousand, five hundred fifty-one".