451999 has 8 divisors (see below), whose sum is σ = 472320. Its totient is φ = 432216.

The previous prime is 451987. The next prime is 452009. The reversal of 451999 is 999154.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 451999 - 2⁵ = 451967 is a prime.

It is a Duffinian number.

451999 is a modest number, since divided by 999 gives 451 as remainder.

451999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2692 + ... + 2854.

It is an arithmetic number, because the mean of its divisors is an integer number (59040).

2⁴⁵¹⁹⁹⁹ is an apocalyptic number.

451999 is a deficient number, since it is larger than the sum of its proper divisors (20321).

451999 is a wasteful number, since it uses less digits than its factorization.

451999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its digits is 14580, while the sum is 37.

The square root of 451999 is about 672.3087088533. The cubic root of 451999 is about 76.7442461920.

It can be divided in two parts, 4 and 51999, that added together give a triangular number (52003 = T₃₂₂).

The spelling of 451999 in words is "four hundred fifty-one thousand, nine hundred ninety-nine".