73988221 has 2 divisors, whose sum is σ = 73988222. Its totient is φ = 73988220.

The previous prime is 73988207. The next prime is 73988237. The reversal of 73988221 is 12288937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62188996 + 11799225 = 7886^2 + 3435^2 .

It is an emirp because it is prime and its reverse (12288937) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73988221 - 2⁹ = 73987709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73988021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36994110 + 36994111.

It is an arithmetic number, because the mean of its divisors is an integer number (36994111).

Almost surely, 2^73988221 is an apocalyptic number.

It is an amenable number.

73988221 is a deficient number, since it is larger than the sum of its proper divisors (1).

73988221 is an equidigital number, since it uses as much as digits as its factorization.

73988221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 73988221 is about 8601.6405993275. The cubic root of 73988221 is about 419.8113684308.

The spelling of 73988221 in words is "seventy-three million, nine hundred eighty-eight thousand, two hundred twenty-one".