91522212 has 12 divisors (see below), whose sum is σ = 213551856. Its totient is φ = 30507400.

The previous prime is 91522181. The next prime is 91522213. The reversal of 91522212 is 21222519.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (91522213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3813414 + ... + 3813437.

It is an arithmetic number, because the mean of its divisors is an integer number (17795988).

Almost surely, 2^91522212 is an apocalyptic number.

It is an amenable number.

91522212 is an abundant number, since it is smaller than the sum of its proper divisors (122029644).

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

91522212 is a wasteful number, since it uses less digits than its factorization.

91522212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7626858 (or 7626856 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 91522212 is about 9566.7242042404. The cubic root of 91522212 is about 450.6528991725.

The spelling of 91522212 in words is "ninety-one million, five hundred twenty-two thousand, two hundred twelve".