161923 has 2 divisors, whose sum is σ = 161924. Its totient is φ = 161922.

The previous prime is 161921. The next prime is 161947. The reversal of 161923 is 329161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161923 - 2¹ = 161921 is a prime.

Together with 161921, it forms a pair of twin primes.

161923 is a lucky number.

It is equal to p₁₄₈₄₅ and since 161923 and 14845 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 161894 and 161903.

It is not a weakly prime, because it can be changed into another prime (161921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80961 + 80962.

It is an arithmetic number, because the mean of its divisors is an integer number (80962).

2¹⁶¹⁹²³ is an apocalyptic number.

161923 is a deficient number, since it is larger than the sum of its proper divisors (1).

161923 is an equidigital number, since it uses as much as digits as its factorization.

161923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 22.

The square root of 161923 is about 402.3965705619. The cubic root of 161923 is about 54.5049794850.

The spelling of 161923 in words is "one hundred sixty-one thousand, nine hundred twenty-three".