73218317 has 2 divisors, whose sum is σ = 73218318. Its totient is φ = 73218316.

The previous prime is 73218289. The next prime is 73218319. The reversal of 73218317 is 71381237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38514436 + 34703881 = 6206^2 + 5891^2 .

It is a cyclic number.

It is not a de Polignac number, because 73218317 - 2¹⁰ = 73217293 is a prime.

Together with 73218319, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_4296065 and since 73218317 and 4296065 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73218319) 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, 36609158 + 36609159.

It is an arithmetic number, because the mean of its divisors is an integer number (36609159).

Almost surely, 2^73218317 is an apocalyptic number.

It is an amenable number.

73218317 is a deficient number, since it is larger than the sum of its proper divisors (1).

73218317 is an equidigital number, since it uses as much as digits as its factorization.

73218317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 73218317 is about 8556.7702434973. The cubic root of 73218317 is about 418.3501354958.

The spelling of 73218317 in words is "seventy-three million, two hundred eighteen thousand, three hundred seventeen".