451531321 has 4 divisors (see below), whose sum is σ = 452832912. Its totient is φ = 450229732.

The previous prime is 451531309. The next prime is 451531357. The reversal of 451531321 is 123135154.

It is a happy number.

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: 123135154 = 2 ⋅61567577.

It is a cyclic number.

It is not a de Polignac number, because 451531321 - 2²⁷ = 317313593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (451531121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650275 + ... + 650968.

It is an arithmetic number, because the mean of its divisors is an integer number (113208228).

Almost surely, 2^451531321 is an apocalyptic number.

It is an amenable number.

451531321 is a deficient number, since it is larger than the sum of its proper divisors (1301591).

451531321 is a wasteful number, since it uses less digits than its factorization.

451531321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301590.

The product of its digits is 1800, while the sum is 25.

The square root of 451531321 is about 21249.2663638065. The cubic root of 451531321 is about 767.1776821424.

Adding to 451531321 its reverse (123135154), we get a palindrome (574666475).

The spelling of 451531321 in words is "four hundred fifty-one million, five hundred thirty-one thousand, three hundred twenty-one".