991010001017 has 4 divisors (see below), whose sum is σ = 999780001140. Its totient is φ = 982240000896.

The previous prime is 991010001001. The next prime is 991010001029. The reversal of 991010001017 is 710100010199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 710100010199 = 601 ⋅1181530799.

It can be written as a sum of positive squares in 2 ways, for example, as 163963445776 + 827046555241 = 404924^2 + 909421^2 .

It is a cyclic number.

It is not a de Polignac number, because 991010001017 - 2⁴ = 991010001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991010001097) 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, 4384999892 + ... + 4385000117.

It is an arithmetic number, because the mean of its divisors is an integer number (249945000285).

Almost surely, 2^991010001017 is an apocalyptic number.

It is an amenable number.

991010001017 is a deficient number, since it is larger than the sum of its proper divisors (8770000123).

991010001017 is a wasteful number, since it uses less digits than its factorization.

991010001017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8770000122.

The product of its (nonzero) digits is 567, while the sum is 29.

The spelling of 991010001017 in words is "nine hundred ninety-one billion, ten million, one thousand, seventeen".