161784923 has 2 divisors, whose sum is σ = 161784924. Its totient is φ = 161784922.

The previous prime is 161784911. The next prime is 161784947. The reversal of 161784923 is 329487161.

It is a weak prime.

It is an emirp because it is prime and its reverse (329487161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161784923 - 2¹⁰ = 161783899 is a prime.

It is a super-2 number, since 2×161784923² = 52348722620231858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161784983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80892461 + 80892462.

It is an arithmetic number, because the mean of its divisors is an integer number (80892462).

Almost surely, 2^161784923 is an apocalyptic number.

161784923 is a deficient number, since it is larger than the sum of its proper divisors (1).

161784923 is an equidigital number, since it uses as much as digits as its factorization.

161784923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 161784923 is about 12719.4702326787. The cubic root of 161784923 is about 544.8948235723.

The spelling of 161784923 in words is "one hundred sixty-one million, seven hundred eighty-four thousand, nine hundred twenty-three".