73617221 has 2 divisors, whose sum is σ = 73617222. Its totient is φ = 73617220.

The previous prime is 73617211. The next prime is 73617233. The reversal of 73617221 is 12271637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 34692100 = 6239^2 + 5890^2 .

It is a cyclic number.

It is not a de Polignac number, because 73617221 - 2¹⁸ = 73355077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73617211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36808610 + 36808611.

It is an arithmetic number, because the mean of its divisors is an integer number (36808611).

Almost surely, 2^73617221 is an apocalyptic number.

It is an amenable number.

73617221 is a deficient number, since it is larger than the sum of its proper divisors (1).

73617221 is an equidigital number, since it uses as much as digits as its factorization.

73617221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 29.

The square root of 73617221 is about 8580.0478436895. The cubic root of 73617221 is about 419.1085039766.

Adding to 73617221 its reverse (12271637), we get a palindrome (85888858).

The spelling of 73617221 in words is "seventy-three million, six hundred seventeen thousand, two hundred twenty-one".