451643 has 4 divisors (see below), whose sum is σ = 457440. Its totient is φ = 445848.

The previous prime is 451637. The next prime is 451657. The reversal of 451643 is 346154.

It is a happy number.

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 451643 - 2⁶ = 451579 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (451663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2780 + ... + 2937.

It is an arithmetic number, because the mean of its divisors is an integer number (114360).

2⁴⁵¹⁶⁴³ is an apocalyptic number.

451643 is a deficient number, since it is larger than the sum of its proper divisors (5797).

451643 is an equidigital number, since it uses as much as digits as its factorization.

451643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5796.

The product of its digits is 1440, while the sum is 23.

The square root of 451643 is about 672.0438973758. The cubic root of 451643 is about 76.7240926610.

Adding to 451643 its reverse (346154), we get a palindrome (797797).

The spelling of 451643 in words is "four hundred fifty-one thousand, six hundred forty-three".