205451 has 4 divisors (see below), whose sum is σ = 210504. Its totient is φ = 200400.

The previous prime is 205441. The next prime is 205453. The reversal of 205451 is 154502.

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 205451 - 2¹⁰ = 204427 is a prime.

It is a super-2 number, since 2×205451² = 84420226802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205453) 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, 2465 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (52626).

2²⁰⁵⁴⁵¹ is an apocalyptic number.

205451 is a deficient number, since it is larger than the sum of its proper divisors (5053).

205451 is an equidigital number, since it uses as much as digits as its factorization.

205451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5052.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 205451 is about 453.2670294650. The cubic root of 205451 is about 59.0068937650.

Adding to 205451 its reverse (154502), we get a palindrome (359953).

It can be divided in two parts, 205 and 451, that added together give a palindrome (656).

The spelling of 205451 in words is "two hundred five thousand, four hundred fifty-one".