99917 has 4 divisors (see below), whose sum is σ = 102396. Its totient is φ = 97440.

The previous prime is 99907. The next prime is 99923. The reversal of 99917 is 71999.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48841 + 51076 = 221^2 + 226^2 .

It is a cyclic number.

It is not a de Polignac number, because 99917 - 2⁴ = 99901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 99917.

It is not an unprimeable number, because it can be changed into a prime (99907) 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, 1178 + ... + 1259.

It is an arithmetic number, because the mean of its divisors is an integer number (25599).

2⁹⁹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

99917 is a deficient number, since it is larger than the sum of its proper divisors (2479).

99917 is a wasteful number, since it uses less digits than its factorization.

99917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478.

The product of its digits is 5103, while the sum is 35.

The square root of 99917 is about 316.0965042515. The cubic root of 99917 is about 46.4030430525.

It can be divided in two parts, 9 and 9917, that multiplied together give a triangular number (89253 = T₄₂₂).

The spelling of 99917 in words is "ninety-nine thousand, nine hundred seventeen".