161235559 has 2 divisors, whose sum is σ = 161235560. Its totient is φ = 161235558.

The previous prime is 161235527. The next prime is 161235587. The reversal of 161235559 is 955532161.

It is a strong prime.

It is an emirp because it is prime and its reverse (955532161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161235559 - 2⁵ = 161235527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161235859) 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, 80617779 + 80617780.

It is an arithmetic number, because the mean of its divisors is an integer number (80617780).

Almost surely, 2^161235559 is an apocalyptic number.

161235559 is a deficient number, since it is larger than the sum of its proper divisors (1).

161235559 is an equidigital number, since it uses as much as digits as its factorization.

161235559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 37.

The square root of 161235559 is about 12697.8564726492. The cubic root of 161235559 is about 544.2773678815.

The spelling of 161235559 in words is "one hundred sixty-one million, two hundred thirty-five thousand, five hundred fifty-nine".