451491 has 4 divisors (see below), whose sum is σ = 601992. Its totient is φ = 300992.

The previous prime is 451481. The next prime is 451499. The reversal of 451491 is 194154.

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 451491 - 2¹⁴ = 435107 is a prime.

It is a D-number.

451491 is a lucky number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (451499) 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, 75246 + ... + 75251.

It is an arithmetic number, because the mean of its divisors is an integer number (150498).

2⁴⁵¹⁴⁹¹ is an apocalyptic number.

451491 is a deficient number, since it is larger than the sum of its proper divisors (150501).

451491 is a wasteful number, since it uses less digits than its factorization.

451491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150500.

The product of its digits is 720, while the sum is 24.

The square root of 451491 is about 671.9308000085. The cubic root of 451491 is about 76.7154845563.

It can be divided in two parts, 45149 and 1, that added together give a triangular number (45150 = T₃₀₀).

The spelling of 451491 in words is "four hundred fifty-one thousand, four hundred ninety-one".