1144455721 has 2 divisors, whose sum is σ = 1144455722. Its totient is φ = 1144455720.

The previous prime is 1144455677. The next prime is 1144455749. The reversal of 1144455721 is 1275544411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1084780096 + 59675625 = 32936^2 + 7725^2 .

It is an emirp because it is prime and its reverse (1275544411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1144455721 - 2²³ = 1136067113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1144405721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572227860 + 572227861.

It is an arithmetic number, because the mean of its divisors is an integer number (572227861).

Almost surely, 2^1144455721 is an apocalyptic number.

It is an amenable number.

1144455721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1144455721 is an equidigital number, since it uses as much as digits as its factorization.

1144455721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 34.

The square root of 1144455721 is about 33829.8052167020. The cubic root of 1144455721 is about 1046.0031638841.

The spelling of 1144455721 in words is "one billion, one hundred forty-four million, four hundred fifty-five thousand, seven hundred twenty-one".