161536789 has 2 divisors, whose sum is σ = 161536790. Its totient is φ = 161536788.

The previous prime is 161536769. The next prime is 161536807. The reversal of 161536789 is 987635161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91680625 + 69856164 = 9575^2 + 8358^2 .

It is a cyclic number.

It is not a de Polignac number, because 161536789 - 2¹¹ = 161534741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161536729) 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, 80768394 + 80768395.

It is an arithmetic number, because the mean of its divisors is an integer number (80768395).

Almost surely, 2^161536789 is an apocalyptic number.

It is an amenable number.

161536789 is a deficient number, since it is larger than the sum of its proper divisors (1).

161536789 is an equidigital number, since it uses as much as digits as its factorization.

161536789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 161536789 is about 12709.7123885633. The cubic root of 161536789 is about 544.6161076241.

The spelling of 161536789 in words is "one hundred sixty-one million, five hundred thirty-six thousand, seven hundred eighty-nine".