91222164 has 72 divisors (see below), whose sum is σ = 252924672. Its totient is φ = 27492480.

The previous prime is 91222151. The next prime is 91222177. The reversal of 91222164 is 46122219.

It is an interprime number because it is at equal distance from previous prime (91222151) and next prime (91222177).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87792 + ... + 88824.

Almost surely, 2^91222164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91222164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126462336).

91222164 is an abundant number, since it is smaller than the sum of its proper divisors (161702508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91222164 is a wasteful number, since it uses less digits than its factorization.

91222164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1272 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 91222164 is about 9551.0294733081. The cubic root of 91222164 is about 450.1598839276.

The spelling of 91222164 in words is "ninety-one million, two hundred twenty-two thousand, one hundred sixty-four".