161000191 has 8 divisors (see below), whose sum is σ = 176690304. Its totient is φ = 145485720.

The previous prime is 161000173. The next prime is 161000197. The reversal of 161000191 is 191000161.

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

It is a cyclic number.

It is not a de Polignac number, because 161000191 - 2¹⁵ = 160967423 is a prime.

161000191 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161000197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41985 + ... + 45658.

It is an arithmetic number, because the mean of its divisors is an integer number (22086288).

Almost surely, 2^161000191 is an apocalyptic number.

161000191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161000191 is a deficient number, since it is larger than the sum of its proper divisors (15690113).

161000191 is a wasteful number, since it uses less digits than its factorization.

161000191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87821.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 161000191 is about 12688.5850669017. The cubic root of 161000191 is about 544.0123976684.

The spelling of 161000191 in words is "one hundred sixty-one million, one hundred ninety-one", and thus it is an aban number.