161789129 has 2 divisors, whose sum is σ = 161789130. Its totient is φ = 161789128.

The previous prime is 161789083. The next prime is 161789149. The reversal of 161789129 is 921987161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117765904 + 44023225 = 10852^2 + 6635^2 .

It is a cyclic number.

It is not a de Polignac number, because 161789129 - 2¹⁶ = 161723593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161789129.

It is not a weakly prime, because it can be changed into another prime (161789149) 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, 80894564 + 80894565.

It is an arithmetic number, because the mean of its divisors is an integer number (80894565).

Almost surely, 2^161789129 is an apocalyptic number.

It is an amenable number.

161789129 is a deficient number, since it is larger than the sum of its proper divisors (1).

161789129 is an equidigital number, since it uses as much as digits as its factorization.

161789129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 44.

The square root of 161789129 is about 12719.6355686788. The cubic root of 161789129 is about 544.8995454951.

The spelling of 161789129 in words is "one hundred sixty-one million, seven hundred eighty-nine thousand, one hundred twenty-nine".