999161 has 8 divisors (see below), whose sum is σ = 1042944. Its totient is φ = 956160.

The previous prime is 999149. The next prime is 999169. The reversal of 999161 is 161999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999161 - 2¹⁴ = 982777 is a prime.

It is a super-3 number, since 3×999161³ = 2992455333517230843, which contains 333 as substring.

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 999161.

It is not an unprimeable number, because it can be changed into a prime (999169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5081 + ... + 5273.

It is an arithmetic number, because the mean of its divisors is an integer number (130368).

2⁹⁹⁹¹⁶¹ is an apocalyptic number.

It is an amenable number.

999161 is a deficient number, since it is larger than the sum of its proper divisors (43783).

999161 is a wasteful number, since it uses less digits than its factorization.

999161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391.

The product of its digits is 4374, while the sum is 35.

The square root of 999161 is about 999.5804119729. The cubic root of 999161 is about 99.9720255083.

The spelling of 999161 in words is "nine hundred ninety-nine thousand, one hundred sixty-one".