451021 has 4 divisors (see below), whose sum is σ = 453952. Its totient is φ = 448092.

The previous prime is 451013. The next prime is 451039. The reversal of 451021 is 120154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120154 = 2 ⋅60077.

It is a cyclic number.

It is not a de Polignac number, because 451021 - 2³ = 451013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 450992 and 451010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451051) 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, 1221 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (113488).

2⁴⁵¹⁰²¹ is an apocalyptic number.

It is an amenable number.

451021 is a deficient number, since it is larger than the sum of its proper divisors (2931).

451021 is a wasteful number, since it uses less digits than its factorization.

451021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 451021 is about 671.5809705464. The cubic root of 451021 is about 76.6888551614.

Adding to 451021 its reverse (120154), we get a palindrome (571175).

The spelling of 451021 in words is "four hundred fifty-one thousand, twenty-one".