91003123 has 4 divisors (see below), whose sum is σ = 92025720. Its totient is φ = 89980528.

The previous prime is 91003117. The next prime is 91003127. The reversal of 91003123 is 32130019.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91003123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91003123.

It is not an unprimeable number, because it can be changed into a prime (91003127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511165 + ... + 511342.

It is an arithmetic number, because the mean of its divisors is an integer number (23006430).

Almost surely, 2^91003123 is an apocalyptic number.

91003123 is a deficient number, since it is larger than the sum of its proper divisors (1022597).

91003123 is a wasteful number, since it uses less digits than its factorization.

91003123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022596.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 91003123 is about 9539.5557024423. Note that the first 3 decimals coincide. The cubic root of 91003123 is about 449.7992899160.

The spelling of 91003123 in words is "ninety-one million, three thousand, one hundred twenty-three".