73222991 has 2 divisors, whose sum is σ = 73222992. Its totient is φ = 73222990.

The previous prime is 73222957. The next prime is 73223041. The reversal of 73222991 is 19922237.

It is a weak prime.

It is an emirp because it is prime and its reverse (19922237) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73222991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73222901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36611495 + 36611496.

It is an arithmetic number, because the mean of its divisors is an integer number (36611496).

Almost surely, 2^73222991 is an apocalyptic number.

73222991 is a deficient number, since it is larger than the sum of its proper divisors (1).

73222991 is an equidigital number, since it uses as much as digits as its factorization.

73222991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 73222991 is about 8557.0433562066. The cubic root of 73222991 is about 418.3590373071.

The spelling of 73222991 in words is "seventy-three million, two hundred twenty-two thousand, nine hundred ninety-one".