161105691 has 8 divisors (see below), whose sum is σ = 215163904. Its totient is φ = 107225640.

The previous prime is 161105689. The next prime is 161105713. The reversal of 161105691 is 196501161.

161105691 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 not a de Polignac number, because 161105691 - 2¹ = 161105689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161105641) 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, 42415 + ... + 46056.

It is an arithmetic number, because the mean of its divisors is an integer number (26895488).

Almost surely, 2^161105691 is an apocalyptic number.

161105691 is a deficient number, since it is larger than the sum of its proper divisors (54058213).

161105691 is an equidigital number, since it uses as much as digits as its factorization.

161105691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89081.

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 161105691 is about 12692.7416660074. The cubic root of 161105691 is about 544.1311983065.

The spelling of 161105691 in words is "one hundred sixty-one million, one hundred five thousand, six hundred ninety-one".