451992809 has 2 divisors, whose sum is σ = 451992810. Its totient is φ = 451992808.

The previous prime is 451992799. The next prime is 451992911. The reversal of 451992809 is 908299154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330221584 + 121771225 = 18172^2 + 11035^2 .

It is a cyclic number.

It is not a de Polignac number, because 451992809 - 2⁸ = 451992553 is a prime.

It is not a weakly prime, because it can be changed into another prime (451902809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225996404 + 225996405.

It is an arithmetic number, because the mean of its divisors is an integer number (225996405).

Almost surely, 2^451992809 is an apocalyptic number.

It is an amenable number.

451992809 is a deficient number, since it is larger than the sum of its proper divisors (1).

451992809 is an equidigital number, since it uses as much as digits as its factorization.

451992809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 47.

The square root of 451992809 is about 21260.1225067025. The cubic root of 451992809 is about 767.4389580343.

The spelling of 451992809 in words is "four hundred fifty-one million, nine hundred ninety-two thousand, eight hundred nine".