191080161 has 16 divisors (see below), whose sum is σ = 285683200. Its totient is φ = 126216144.

The previous prime is 191080151. The next prime is 191080163. The reversal of 191080161 is 161080191.

It is not a de Polignac number, because 191080161 - 2⁵ = 191080129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

191080161 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191080163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29521 + ... + 35406.

It is an arithmetic number, because the mean of its divisors is an integer number (17855200).

Almost surely, 2^191080161 is an apocalyptic number.

It is an amenable number.

191080161 is a deficient number, since it is larger than the sum of its proper divisors (94603039).

191080161 is a wasteful number, since it uses less digits than its factorization.

191080161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65045 (or 65039 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 191080161 is about 13823.1747800569. The cubic root of 191080161 is about 575.9770769957.

The spelling of 191080161 in words is "one hundred ninety-one million, eighty thousand, one hundred sixty-one".