7221144457 has 2 divisors, whose sum is σ = 7221144458. Its totient is φ = 7221144456.

The previous prime is 7221144421. The next prime is 7221144473. The reversal of 7221144457 is 7544411227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7161221376 + 59923081 = 84624^2 + 7741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7221144457 is a prime.

It is not a weakly prime, because it can be changed into another prime (7221144487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610572228 + 3610572229.

It is an arithmetic number, because the mean of its divisors is an integer number (3610572229).

Almost surely, 2^7221144457 is an apocalyptic number.

It is an amenable number.

7221144457 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221144457 is an equidigital number, since it uses as much as digits as its factorization.

7221144457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 37.

The square root of 7221144457 is about 84977.3173087972. The cubic root of 7221144457 is about 1932.8671763515.

The spelling of 7221144457 in words is "seven billion, two hundred twenty-one million, one hundred forty-four thousand, four hundred fifty-seven".