91228055 has 16 divisors (see below), whose sum is σ = 113702400. Its totient is φ = 70183680.

The previous prime is 91228043. The next prime is 91228057. The reversal of 91228055 is 55082219.

It is not a de Polignac number, because 91228055 - 2⁶ = 91227991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91228057) 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 in 15 ways as a sum of consecutive naturals, for example, 39626 + ... + 41864.

It is an arithmetic number, because the mean of its divisors is an integer number (7106400).

Almost surely, 2^91228055 is an apocalyptic number.

91228055 is a deficient number, since it is larger than the sum of its proper divisors (22474345).

91228055 is a wasteful number, since it uses less digits than its factorization.

91228055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2554.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 91228055 is about 9551.3378644041. The cubic root of 91228055 is about 450.1695739513.

The spelling of 91228055 in words is "ninety-one million, two hundred twenty-eight thousand, fifty-five".