91222387 has 4 divisors (see below), whose sum is σ = 91631680. Its totient is φ = 90813096.

The previous prime is 91222361. The next prime is 91222403. The reversal of 91222387 is 78322219.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91222387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91222337) 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, 204312 + ... + 204757.

It is an arithmetic number, because the mean of its divisors is an integer number (22907920).

Almost surely, 2^91222387 is an apocalyptic number.

91222387 is a deficient number, since it is larger than the sum of its proper divisors (409293).

91222387 is a wasteful number, since it uses less digits than its factorization.

91222387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409292.

The product of its digits is 12096, while the sum is 34.

The square root of 91222387 is about 9551.0411474352. The cubic root of 91222387 is about 450.1602507448.

The spelling of 91222387 in words is "ninety-one million, two hundred twenty-two thousand, three hundred eighty-seven".