451520321 has 4 divisors (see below), whose sum is σ = 516023232. Its totient is φ = 387017412.

The previous prime is 451520317. The next prime is 451520327. The reversal of 451520321 is 123025154.

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.

It is a cyclic number.

It is not a de Polignac number, because 451520321 - 2² = 451520317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (451520327) 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, 32251445 + ... + 32251458.

It is an arithmetic number, because the mean of its divisors is an integer number (129005808).

Almost surely, 2^451520321 is an apocalyptic number.

It is an amenable number.

451520321 is a deficient number, since it is larger than the sum of its proper divisors (64502911).

451520321 is an equidigital number, since it uses as much as digits as its factorization.

451520321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64502910.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 451520321 is about 21249.0075297648. The cubic root of 451520321 is about 767.1714522143.

Adding to 451520321 its reverse (123025154), we get a palindrome (574545475).

The spelling of 451520321 in words is "four hundred fifty-one million, five hundred twenty thousand, three hundred twenty-one".