161423111 has 2 divisors, whose sum is σ = 161423112. Its totient is φ = 161423110.

The previous prime is 161423083. The next prime is 161423113. The reversal of 161423111 is 111324161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161423111 is a prime.

Together with 161423113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161423113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80711555 + 80711556.

It is an arithmetic number, because the mean of its divisors is an integer number (80711556).

Almost surely, 2^161423111 is an apocalyptic number.

161423111 is a deficient number, since it is larger than the sum of its proper divisors (1).

161423111 is an equidigital number, since it uses as much as digits as its factorization.

161423111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 20.

The square root of 161423111 is about 12705.2395097456. The cubic root of 161423111 is about 544.4883237330.

Adding to 161423111 its reverse (111324161), we get a palindrome (272747272).

The spelling of 161423111 in words is "one hundred sixty-one million, four hundred twenty-three thousand, one hundred eleven".