1451322721 has 4 divisors (see below), whose sum is σ = 1458616000. Its totient is φ = 1444029444.

The previous prime is 1451322707. The next prime is 1451322727. The reversal of 1451322721 is 1272231541.

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 1451322721 - 2⁹ = 1451322209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1451322721.

It is not an unprimeable number, because it can be changed into a prime (1451322727) 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, 3646341 + ... + 3646738.

It is an arithmetic number, because the mean of its divisors is an integer number (364654000).

Almost surely, 2^1451322721 is an apocalyptic number.

It is an amenable number.

1451322721 is a deficient number, since it is larger than the sum of its proper divisors (7293279).

1451322721 is an equidigital number, since it uses as much as digits as its factorization.

1451322721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7293278.

The product of its digits is 3360, while the sum is 28.

The square root of 1451322721 is about 38096.2297478373. The cubic root of 1451322721 is about 1132.1952576504.

The spelling of 1451322721 in words is "one billion, four hundred fifty-one million, three hundred twenty-two thousand, seven hundred twenty-one".