999203161 has 4 divisors (see below), whose sum is σ = 1090039824. Its totient is φ = 908366500.

The previous prime is 999203159. The next prime is 999203171. The reversal of 999203161 is 161302999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 999203161 - 2¹ = 999203159 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999203131) 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, 45418315 + ... + 45418336.

It is an arithmetic number, because the mean of its divisors is an integer number (272509956).

Almost surely, 2^999203161 is an apocalyptic number.

999203161 is the 14137-th centered decagonal number.

It is an amenable number.

999203161 is a deficient number, since it is larger than the sum of its proper divisors (90836663).

999203161 is a wasteful number, since it uses less digits than its factorization.

999203161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90836662.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 999203161 is about 31610.1749599714. The cubic root of 999203161 is about 999.7343164185.

The spelling of 999203161 in words is "nine hundred ninety-nine million, two hundred three thousand, one hundred sixty-one".