999545 has 4 divisors (see below), whose sum is σ = 1199460. Its totient is φ = 799632.

The previous prime is 999541. The next prime is 999553. The reversal of 999545 is 545999.

999545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545999 = 47 ⋅11617.

It can be written as a sum of positive squares in 2 ways, for example, as 781456 + 218089 = 884^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 999545 - 2² = 999541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999541) 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, 99950 + ... + 99959.

It is an arithmetic number, because the mean of its divisors is an integer number (299865).

2⁹⁹⁹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

999545 is a deficient number, since it is larger than the sum of its proper divisors (199915).

999545 is a wasteful number, since it uses less digits than its factorization.

999545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199914.

The product of its digits is 72900, while the sum is 41.

The square root of 999545 is about 999.7724741160. The cubic root of 999545 is about 99.9848310325.

The spelling of 999545 in words is "nine hundred ninety-nine thousand, five hundred forty-five".