91162221 has 4 divisors (see below), whose sum is σ = 121549632. Its totient is φ = 60774812.

The previous prime is 91162219. The next prime is 91162231. The reversal of 91162221 is 12226119.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91162221 - 2¹ = 91162219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91162191 and 91162200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91162231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15193701 + ... + 15193706.

It is an arithmetic number, because the mean of its divisors is an integer number (30387408).

Almost surely, 2^91162221 is an apocalyptic number.

It is an amenable number.

91162221 is a deficient number, since it is larger than the sum of its proper divisors (30387411).

91162221 is a wasteful number, since it uses less digits than its factorization.

91162221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30387410.

The product of its digits is 432, while the sum is 24.

The square root of 91162221 is about 9547.8909189412. The cubic root of 91162221 is about 450.0612607957.

The spelling of 91162221 in words is "ninety-one million, one hundred sixty-two thousand, two hundred twenty-one".