161423923 has 4 divisors (see below), whose sum is σ = 161711208. Its totient is φ = 161136640.

The previous prime is 161423921. The next prime is 161423987. The reversal of 161423923 is 329324161.

161423923 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.

It is a cyclic number.

It is not a de Polignac number, because 161423923 - 2¹ = 161423921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161423921) 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, 142798 + ... + 143923.

It is an arithmetic number, because the mean of its divisors is an integer number (40427802).

Almost surely, 2^161423923 is an apocalyptic number.

161423923 is a deficient number, since it is larger than the sum of its proper divisors (287285).

161423923 is an equidigital number, since it uses as much as digits as its factorization.

161423923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287284.

The product of its digits is 7776, while the sum is 31.

The square root of 161423923 is about 12705.2714650258. The cubic root of 161423923 is about 544.4892367038.

The spelling of 161423923 in words is "one hundred sixty-one million, four hundred twenty-three thousand, nine hundred twenty-three".