91123903 has 8 divisors (see below), whose sum is σ = 98280000. Its totient is φ = 83988768.

The previous prime is 91123883. The next prime is 91123913. The reversal of 91123903 is 30932119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91123903 - 2⁵ = 91123871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91123913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4473 + ... + 14221.

It is an arithmetic number, because the mean of its divisors is an integer number (12285000).

Almost surely, 2^91123903 is an apocalyptic number.

91123903 is a deficient number, since it is larger than the sum of its proper divisors (7156097).

91123903 is a wasteful number, since it uses less digits than its factorization.

91123903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10481.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 91123903 is about 9545.8840868722. The cubic root of 91123903 is about 449.9981942314.

The spelling of 91123903 in words is "ninety-one million, one hundred twenty-three thousand, nine hundred three".