823161 has 8 divisors (see below), whose sum is σ = 1110240. Its totient is φ = 542432.

The previous prime is 823153. The next prime is 823169. The reversal of 823161 is 161328.

It is an interprime number because it is at equal distance from previous prime (823153) and next prime (823169).

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 823161 - 2³ = 823153 is a prime.

823161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (823169) 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, 1275 + ... + 1808.

It is an arithmetic number, because the mean of its divisors is an integer number (138780).

2⁸²³¹⁶¹ is an apocalyptic number.

It is an amenable number.

823161 is a deficient number, since it is larger than the sum of its proper divisors (287079).

823161 is a wasteful number, since it uses less digits than its factorization.

823161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175.

The product of its digits is 288, while the sum is 21.

The square root of 823161 is about 907.2822052702. The cubic root of 823161 is about 93.7191329493.

Adding to 823161 its reverse (161328), we get a palindrome (984489).

The spelling of 823161 in words is "eight hundred twenty-three thousand, one hundred sixty-one".