91222865 has 8 divisors (see below), whose sum is σ = 109885248. Its totient is φ = 72699760.

The previous prime is 91222861. The next prime is 91222889. The reversal of 91222865 is 56822219.

It is a happy number.

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

It is not a de Polignac number, because 91222865 - 2² = 91222861 is a prime.

It is a super-2 number, since 2×91222865² = 16643222197616450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91222861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33371 + ... + 36000.

It is an arithmetic number, because the mean of its divisors is an integer number (13735656).

Almost surely, 2^91222865 is an apocalyptic number.

It is an amenable number.

91222865 is a deficient number, since it is larger than the sum of its proper divisors (18662383).

91222865 is a wasteful number, since it uses less digits than its factorization.

91222865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69639.

The product of its digits is 17280, while the sum is 35.

The square root of 91222865 is about 9551.0661708523. The cubic root of 91222865 is about 450.1610370146.

The spelling of 91222865 in words is "ninety-one million, two hundred twenty-two thousand, eight hundred sixty-five".