161269129 has 4 divisors (see below), whose sum is σ = 184307584. Its totient is φ = 138230676.

The previous prime is 161269127. The next prime is 161269151. The reversal of 161269129 is 921962161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161269129 - 2¹ = 161269127 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161269127) 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 in 3 ways as a sum of consecutive naturals, for example, 11519217 + ... + 11519230.

It is an arithmetic number, because the mean of its divisors is an integer number (46076896).

Almost surely, 2^161269129 is an apocalyptic number.

It is an amenable number.

161269129 is a deficient number, since it is larger than the sum of its proper divisors (23038455).

161269129 is an equidigital number, since it uses as much as digits as its factorization.

161269129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23038454.

The product of its digits is 11664, while the sum is 37.

The square root of 161269129 is about 12699.1782805030. The cubic root of 161269129 is about 544.3151389609.

The spelling of 161269129 in words is "one hundred sixty-one million, two hundred sixty-nine thousand, one hundred twenty-nine".