451721530 has 32 divisors (see below), whose sum is σ = 899320464. Its totient is φ = 162279936.

The previous prime is 451721521. The next prime is 451721533. The reversal of 451721530 is 35127154.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 246458601 + 205262929 = 15699^2 + 14327^2 .

It is not an unprimeable number, because it can be changed into a prime (451721533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42147 + ... + 51766.

Almost surely, 2^451721530 is an apocalyptic number.

451721530 is a deficient number, since it is larger than the sum of its proper divisors (447598934).

451721530 is a wasteful number, since it uses less digits than its factorization.

451721530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93970.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 451721530 is about 21253.7415529596. The cubic root of 451721530 is about 767.2853923627.

Adding to 451721530 its reverse (35127154), we get a palindrome (486848684).

The spelling of 451721530 in words is "four hundred fifty-one million, seven hundred twenty-one thousand, five hundred thirty".