161422823 has 8 divisors (see below), whose sum is σ = 166002240. Its totient is φ = 156854880.

The previous prime is 161422819. The next prime is 161422829. The reversal of 161422823 is 328224161.

It is a happy number.

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 161422823 - 2² = 161422819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161422829) 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, 31313 + ... + 36101.

It is an arithmetic number, because the mean of its divisors is an integer number (20750280).

Almost surely, 2^161422823 is an apocalyptic number.

161422823 is a deficient number, since it is larger than the sum of its proper divisors (4579417).

161422823 is an equidigital number, since it uses as much as digits as its factorization.

161422823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5737.

The product of its digits is 4608, while the sum is 29.

The square root of 161422823 is about 12705.2281758338. The cubic root of 161422823 is about 544.4879999199.

Adding to 161422823 its reverse (328224161), we get a palindrome (489646984).

The spelling of 161422823 in words is "one hundred sixty-one million, four hundred twenty-two thousand, eight hundred twenty-three".