129161559 has 4 divisors (see below), whose sum is σ = 172215416. Its totient is φ = 86107704.

The previous prime is 129161509. The next prime is 129161573. The reversal of 129161559 is 955161921.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 129161559 - 2²¹ = 127064407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129161509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21526924 + ... + 21526929.

It is an arithmetic number, because the mean of its divisors is an integer number (43053854).

Almost surely, 2^129161559 is an apocalyptic number.

129161559 is a deficient number, since it is larger than the sum of its proper divisors (43053857).

129161559 is an equidigital number, since it uses as much as digits as its factorization.

129161559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43053856.

The product of its digits is 24300, while the sum is 39.

The square root of 129161559 is about 11364.9267045591. The cubic root of 129161559 is about 505.4882824268.

The spelling of 129161559 in words is "one hundred twenty-nine million, one hundred sixty-one thousand, five hundred fifty-nine".