91222817 has 8 divisors (see below), whose sum is σ = 106473216. Its totient is φ = 76527072.

The previous prime is 91222793. The next prime is 91222829. The reversal of 91222817 is 71822219.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91222817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91222847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138308 + ... + 138965.

It is an arithmetic number, because the mean of its divisors is an integer number (13309152).

Almost surely, 2^91222817 is an apocalyptic number.

It is an amenable number.

91222817 is a deficient number, since it is larger than the sum of its proper divisors (15250399).

91222817 is a wasteful number, since it uses less digits than its factorization.

91222817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277327.

The product of its digits is 4032, while the sum is 32.

The square root of 91222817 is about 9551.0636580435. The cubic root of 91222817 is about 450.1609580588.

The spelling of 91222817 in words is "ninety-one million, two hundred twenty-two thousand, eight hundred seventeen".