161129 has 4 divisors (see below), whose sum is σ = 163920. Its totient is φ = 158340.

The previous prime is 161123. The next prime is 161137. The reversal of 161129 is 921161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 921161 = 61 ⋅15101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161129.

It is not an unprimeable number, because it can be changed into a prime (161123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1307 + ... + 1424.

It is an arithmetic number, because the mean of its divisors is an integer number (40980).

2¹⁶¹¹²⁹ is an apocalyptic number.

It is an amenable number.

161129 is a deficient number, since it is larger than the sum of its proper divisors (2791).

161129 is an equidigital number, since it uses as much as digits as its factorization.

161129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2790.

The product of its digits is 108, while the sum is 20.

The square root of 161129 is about 401.4087692116. The cubic root of 161129 is about 54.4157438932.

The spelling of 161129 in words is "one hundred sixty-one thousand, one hundred twenty-nine".