451522321 has 4 divisors (see below), whose sum is σ = 453129444. Its totient is φ = 449915200.

The previous prime is 451522319. The next prime is 451522333. The reversal of 451522321 is 123225154.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 146531025 + 304991296 = 12105^2 + 17464^2 .

It is a cyclic number.

It is not a de Polignac number, because 451522321 - 2¹ = 451522319 is a prime.

It is a super-2 number, since 2×451522321² = 407744812722454082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (451522021) 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, 803140 + ... + 803701.

It is an arithmetic number, because the mean of its divisors is an integer number (113282361).

Almost surely, 2^451522321 is an apocalyptic number.

It is an amenable number.

451522321 is a deficient number, since it is larger than the sum of its proper divisors (1607123).

451522321 is a wasteful number, since it uses less digits than its factorization.

451522321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607122.

The product of its digits is 2400, while the sum is 25.

The square root of 451522321 is about 21249.0545907341. The cubic root of 451522321 is about 767.1725849360.

Adding to 451522321 its reverse (123225154), we get a palindrome (574747475).

The spelling of 451522321 in words is "four hundred fifty-one million, five hundred twenty-two thousand, three hundred twenty-one".