91817069 has 2 divisors, whose sum is σ = 91817070. Its totient is φ = 91817068.

The previous prime is 91817053. The next prime is 91817107. The reversal of 91817069 is 96071819.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57183844 + 34633225 = 7562^2 + 5885^2 .

It is an emirp because it is prime and its reverse (96071819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91817069 - 2⁴ = 91817053 is a prime.

It is a super-2 number, since 2×91817069² = 16860748319501522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91817569) 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, 45908534 + 45908535.

It is an arithmetic number, because the mean of its divisors is an integer number (45908535).

Almost surely, 2^91817069 is an apocalyptic number.

It is an amenable number.

91817069 is a deficient number, since it is larger than the sum of its proper divisors (1).

91817069 is an equidigital number, since it uses as much as digits as its factorization.

91817069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 91817069 is about 9582.1223640695. The cubic root of 91817069 is about 451.1363363478.

The spelling of 91817069 in words is "ninety-one million, eight hundred seventeen thousand, sixty-nine".