161193839 has 2 divisors, whose sum is σ = 161193840. Its totient is φ = 161193838.

The previous prime is 161193833. The next prime is 161193869. The reversal of 161193839 is 938391161.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161193839 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161193796 and 161193805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161193833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80596919 + 80596920.

It is an arithmetic number, because the mean of its divisors is an integer number (80596920).

Almost surely, 2^161193839 is an apocalyptic number.

161193839 is a deficient number, since it is larger than the sum of its proper divisors (1).

161193839 is an equidigital number, since it uses as much as digits as its factorization.

161193839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 41.

The square root of 161193839 is about 12696.2135694072. The cubic root of 161193839 is about 544.2304195724.

The spelling of 161193839 in words is "one hundred sixty-one million, one hundred ninety-three thousand, eight hundred thirty-nine".