91129222 has 4 divisors (see below), whose sum is σ = 136693836. Its totient is φ = 45564610.

The previous prime is 91129211. The next prime is 91129229. The reversal of 91129222 is 22292119.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91129229) 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, 22782304 + ... + 22782307.

It is an arithmetic number, because the mean of its divisors is an integer number (34173459).

Almost surely, 2^91129222 is an apocalyptic number.

91129222 is a deficient number, since it is larger than the sum of its proper divisors (45564614).

91129222 is a wasteful number, since it uses less digits than its factorization.

91129222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45564613.

The product of its digits is 1296, while the sum is 28.

The square root of 91129222 is about 9546.1626845555. The cubic root of 91129222 is about 450.0069496869.

The spelling of 91129222 in words is "ninety-one million, one hundred twenty-nine thousand, two hundred twenty-two".