805451 has 2 divisors, whose sum is σ = 805452. Its totient is φ = 805450.

The previous prime is 805421. The next prime is 805463. The reversal of 805451 is 154508.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 805451 - 2¹⁴ = 789067 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 805451.

It is not a weakly prime, because it can be changed into another prime (805421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402725 + 402726.

It is an arithmetic number, because the mean of its divisors is an integer number (402726).

2⁸⁰⁵⁴⁵¹ is an apocalyptic number.

805451 is a deficient number, since it is larger than the sum of its proper divisors (1).

805451 is an equidigital number, since it uses as much as digits as its factorization.

805451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 805451 is about 897.4692195279. The cubic root of 805451 is about 93.0421437698.

Adding to 805451 its reverse (154508), we get a palindrome (959959).

The spelling of 805451 in words is "eight hundred five thousand, four hundred fifty-one".