205440451 has 2 divisors, whose sum is σ = 205440452. Its totient is φ = 205440450.

The previous prime is 205440449. The next prime is 205440467. The reversal of 205440451 is 154044502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205440451 - 2¹ = 205440449 is a prime.

Together with 205440449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (205440421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102720225 + 102720226.

It is an arithmetic number, because the mean of its divisors is an integer number (102720226).

Almost surely, 2^205440451 is an apocalyptic number.

205440451 is a deficient number, since it is larger than the sum of its proper divisors (1).

205440451 is an equidigital number, since it uses as much as digits as its factorization.

205440451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 205440451 is about 14333.1940264548. The cubic root of 205440451 is about 590.0588383340.

Adding to 205440451 its reverse (154044502), we get a palindrome (359484953).

The spelling of 205440451 in words is "two hundred five million, four hundred forty thousand, four hundred fifty-one".