451391 has 4 divisors (see below), whose sum is σ = 465984. Its totient is φ = 436800.

The previous prime is 451387. The next prime is 451397. The reversal of 451391 is 193154.

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 451391 - 2² = 451387 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 451391.

It is not an unprimeable number, because it can be changed into a prime (451397) 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 3 ways as a sum of consecutive naturals, for example, 7250 + ... + 7311.

It is an arithmetic number, because the mean of its divisors is an integer number (116496).

2⁴⁵¹³⁹¹ is an apocalyptic number.

451391 is a deficient number, since it is larger than the sum of its proper divisors (14593).

451391 is a wasteful number, since it uses less digits than its factorization.

451391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14592.

The product of its digits is 540, while the sum is 23.

The square root of 451391 is about 671.8563834630. The cubic root of 451391 is about 76.7098202759.

The spelling of 451391 in words is "four hundred fifty-one thousand, three hundred ninety-one".