205364251 has 4 divisors (see below), whose sum is σ = 205393504. Its totient is φ = 205335000.

The previous prime is 205364231. The next prime is 205364281. The reversal of 205364251 is 152463502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a 3-Lehmer number, since φ(205364251) divides (205364251-1)³.

It is a cyclic number.

It is not a de Polignac number, because 205364251 - 2⁷ = 205364123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205364231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2926 + ... + 20476.

It is an arithmetic number, because the mean of its divisors is an integer number (51348376).

Almost surely, 2^205364251 is an apocalyptic number.

205364251 is the 11701-st pentagonal number.

205364251 is a deficient number, since it is larger than the sum of its proper divisors (29253).

205364251 is a wasteful number, since it uses less digits than its factorization.

205364251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29252.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 205364251 is about 14330.5356145540. The cubic root of 205364251 is about 589.9858763257.

The spelling of 205364251 in words is "two hundred five million, three hundred sixty-four thousand, two hundred fifty-one".