91022212 has 6 divisors (see below), whose sum is σ = 159288878. Its totient is φ = 45511104.

The previous prime is 91022209. The next prime is 91022219. The reversal of 91022212 is 21222019.

It can be written as a sum of positive squares in only one way, i.e., 69622336 + 21399876 = 8344^2 + 4626^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 91022212.

It is not an unprimeable number, because it can be changed into a prime (91022219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11377773 + ... + 11377780.

Almost surely, 2^91022212 is an apocalyptic number.

It is an amenable number.

91022212 is a deficient number, since it is larger than the sum of its proper divisors (68266666).

91022212 is a wasteful number, since it uses less digits than its factorization.

91022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22755557 (or 22755555 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 91022212 is about 9540.5561682745. The cubic root of 91022212 is about 449.8307379882.

The spelling of 91022212 in words is "ninety-one million, twenty-two thousand, two hundred twelve".