205451151 has 4 divisors (see below), whose sum is σ = 273934872. Its totient is φ = 136967432.

The previous prime is 205451149. The next prime is 205451159. The reversal of 205451151 is 151154502.

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

It is a cyclic number.

It is not a de Polignac number, because 205451151 - 2¹ = 205451149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205451159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34241856 + ... + 34241861.

It is an arithmetic number, because the mean of its divisors is an integer number (68483718).

Almost surely, 2^205451151 is an apocalyptic number.

205451151 is a deficient number, since it is larger than the sum of its proper divisors (68483721).

205451151 is an equidigital number, since it uses as much as digits as its factorization.

205451151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68483720.

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 205451151 is about 14333.5672810365. The cubic root of 205451151 is about 590.0690822107.

The spelling of 205451151 in words is "two hundred five million, four hundred fifty-one thousand, one hundred fifty-one".