91128103 has 4 divisors (see below), whose sum is σ = 99412488. Its totient is φ = 82843720.

The previous prime is 91128101. The next prime is 91128113. The reversal of 91128103 is 30182119.

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

It is a cyclic number.

It is not a de Polignac number, because 91128103 - 2¹ = 91128101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91128101) 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 3 ways as a sum of consecutive naturals, for example, 4142176 + ... + 4142197.

It is an arithmetic number, because the mean of its divisors is an integer number (24853122).

Almost surely, 2^91128103 is an apocalyptic number.

91128103 is a deficient number, since it is larger than the sum of its proper divisors (8284385).

91128103 is a wasteful number, since it uses less digits than its factorization.

91128103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8284384.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 91128103 is about 9546.1040744379. The cubic root of 91128103 is about 450.0051077610.

The spelling of 91128103 in words is "ninety-one million, one hundred twenty-eight thousand, one hundred three".