999601 has 4 divisors (see below), whose sum is σ = 1034100. Its totient is φ = 965104.

The previous prime is 999599. The next prime is 999611. The reversal of 999601 is 106999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106999 = 67 ⋅1597.

It can be written as a sum of positive squares in 2 ways, for example, as 564001 + 435600 = 751^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 999601 - 2¹ = 999599 is a prime.

It is a Duffinian number.

999601 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (999611) 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, 17206 + ... + 17263.

It is an arithmetic number, because the mean of its divisors is an integer number (258525).

2⁹⁹⁹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

999601 is a deficient number, since it is larger than the sum of its proper divisors (34499).

999601 is a wasteful number, since it uses less digits than its factorization.

999601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34498.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 999601 is about 999.8004800959. The cubic root of 999601 is about 99.9866982307.

It can be divided in two parts, 999 and 601, that added together give a square (1600 = 40²).

The spelling of 999601 in words is "nine hundred ninety-nine thousand, six hundred one".