161291 has 8 divisors (see below), whose sum is σ = 183120. Its totient is φ = 140832.

The previous prime is 161281. The next prime is 161303. The reversal of 161291 is 192161.

161291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80 + ... + 573.

It is an arithmetic number, because the mean of its divisors is an integer number (22890).

2¹⁶¹²⁹¹ is an apocalyptic number.

161291 is a deficient number, since it is larger than the sum of its proper divisors (21829).

161291 is a wasteful number, since it uses less digits than its factorization.

161291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

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

The square root of 161291 is about 401.6105078307. The cubic root of 161291 is about 54.4339744162.

The spelling of 161291 in words is "one hundred sixty-one thousand, two hundred ninety-one".