205340451 has 4 divisors (see below), whose sum is σ = 273787272. Its totient is φ = 136893632.

The previous prime is 205340393. The next prime is 205340479. The reversal of 205340451 is 154043502.

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 205340451 - 2¹¹ = 205338403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205340951) 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, 34223406 + ... + 34223411.

It is an arithmetic number, because the mean of its divisors is an integer number (68446818).

Almost surely, 2^205340451 is an apocalyptic number.

205340451 is a deficient number, since it is larger than the sum of its proper divisors (68446821).

205340451 is an equidigital number, since it uses as much as digits as its factorization.

205340451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68446820.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 205340451 is about 14329.7051958510. The cubic root of 205340451 is about 589.9630839681.

Adding to 205340451 its reverse (154043502), we get a palindrome (359383953).

The spelling of 205340451 in words is "two hundred five million, three hundred forty thousand, four hundred fifty-one".