451661443 has 2 divisors, whose sum is σ = 451661444. Its totient is φ = 451661442.

The previous prime is 451661401. The next prime is 451661467. The reversal of 451661443 is 344166154.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 451661443 - 2⁹ = 451660931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 451661399 and 451661408.

It is not a weakly prime, because it can be changed into another prime (451661543) 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, 225830721 + 225830722.

It is an arithmetic number, because the mean of its divisors is an integer number (225830722).

Almost surely, 2^451661443 is an apocalyptic number.

451661443 is a deficient number, since it is larger than the sum of its proper divisors (1).

451661443 is an equidigital number, since it uses as much as digits as its factorization.

451661443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 34.

The square root of 451661443 is about 21252.3279430748. The cubic root of 451661443 is about 767.2513699849.

The spelling of 451661443 in words is "four hundred fifty-one million, six hundred sixty-one thousand, four hundred forty-three".