91221267 has 4 divisors (see below), whose sum is σ = 121628360. Its totient is φ = 60814176.

The previous prime is 91221217. The next prime is 91221307. The reversal of 91221267 is 76212219.

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

It is not a de Polignac number, because 91221267 - 2⁶ = 91221203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91221217) 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 3 ways as a sum of consecutive naturals, for example, 15203542 + ... + 15203547.

It is an arithmetic number, because the mean of its divisors is an integer number (30407090).

Almost surely, 2^91221267 is an apocalyptic number.

91221267 is a deficient number, since it is larger than the sum of its proper divisors (30407093).

91221267 is a wasteful number, since it uses less digits than its factorization.

91221267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30407092.

The product of its digits is 3024, while the sum is 30.

The square root of 91221267 is about 9550.9825149039. The cubic root of 91221267 is about 450.1584084283.

The spelling of 91221267 in words is "ninety-one million, two hundred twenty-one thousand, two hundred sixty-seven".