91121003 has 8 divisors (see below), whose sum is σ = 97041888. Its totient is φ = 85262464.

The previous prime is 91120961. The next prime is 91121039. The reversal of 91121003 is 30012119.

It is a happy number.

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 91121003 - 2¹⁰ = 91119979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91121903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12551 + ... + 18432.

It is an arithmetic number, because the mean of its divisors is an integer number (12130236).

Almost surely, 2^91121003 is an apocalyptic number.

91121003 is a deficient number, since it is larger than the sum of its proper divisors (5920885).

91121003 is a wasteful number, since it uses less digits than its factorization.

91121003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31173.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 91121003 is about 9545.7321877371. The cubic root of 91121003 is about 449.9934204799.

The spelling of 91121003 in words is "ninety-one million, one hundred twenty-one thousand, three".