99999917 has 4 divisors (see below), whose sum is σ = 103448220. Its totient is φ = 96551616.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999917 is 71999999.

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 78340201 + 21659716 = 8851^2 + 4654^2 .

It is a cyclic number.

It is not a de Polignac number, because 99999917 - 2²² = 95805613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99999917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999217) 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, 1724108 + ... + 1724165.

It is an arithmetic number, because the mean of its divisors is an integer number (25862055).

Almost surely, 2^99999917 is an apocalyptic number.

It is an amenable number.

99999917 is a deficient number, since it is larger than the sum of its proper divisors (3448303).

99999917 is a wasteful number, since it uses less digits than its factorization.

99999917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3448302.

The product of its digits is 3720087, while the sum is 62.

The square root of 99999917 is about 9999.9958499991. The cubic root of 99999917 is about 464.1587549440.

The spelling of 99999917 in words is "ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventeen".