9991017 has 12 divisors (see below), whose sum is σ = 15191280. Its totient is φ = 6310008.

The previous prime is 9990997. The next prime is 9991027. The reversal of 9991017 is 7101999.

9991017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-9991017 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9991027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29043 + ... + 29384.

It is an arithmetic number, because the mean of its divisors is an integer number (1265940).

Almost surely, 2^9991017 is an apocalyptic number.

It is an amenable number.

9991017 is a deficient number, since it is larger than the sum of its proper divisors (5200263).

9991017 is a wasteful number, since it uses less digits than its factorization.

9991017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58452 (or 58449 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 9991017 is about 3160.8570040418. The cubic root of 9991017 is about 215.3789387207.

It can be divided in two parts, 999 and 1017, that added together give a triangular number (2016 = T₆₃).

The spelling of 9991017 in words is "nine million, nine hundred ninety-one thousand, seventeen".