91198217 has 8 divisors (see below), whose sum is σ = 105341472. Its totient is φ = 78030400.

The previous prime is 91198207. The next prime is 91198259. The reversal of 91198217 is 71289119.

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

It is a cyclic number.

It is not a de Polignac number, because 91198217 - 2¹² = 91194121 is a prime.

It is a super-2 number, since 2×91198217² = 16634229567958178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91198207) 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, 243659 + ... + 244032.

It is an arithmetic number, because the mean of its divisors is an integer number (13167684).

Almost surely, 2^91198217 is an apocalyptic number.

It is an amenable number.

91198217 is a deficient number, since it is larger than the sum of its proper divisors (14143255).

91198217 is a wasteful number, since it uses less digits than its factorization.

91198217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487719.

The product of its digits is 9072, while the sum is 38.

The square root of 91198217 is about 9549.7757565296. The cubic root of 91198217 is about 450.1204895462.

The spelling of 91198217 in words is "ninety-one million, one hundred ninety-eight thousand, two hundred seventeen".