191097 has 12 divisors (see below), whose sum is σ = 292500. Its totient is φ = 119808.

The previous prime is 191089. The next prime is 191099. The reversal of 191097 is 790191.

It can be written as a sum of positive squares in 2 ways, for example, as 114921 + 76176 = 339^2 + 276^2 .

It is not a de Polignac number, because 191097 - 2³ = 191089 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 191097.

It is not an unprimeable number, because it can be changed into a prime (191099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472 + ... + 777.

It is an arithmetic number, because the mean of its divisors is an integer number (24375).

2¹⁹¹⁰⁹⁷ is an apocalyptic number.

191097 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

191097 is a deficient number, since it is larger than the sum of its proper divisors (101403).

191097 is a wasteful number, since it uses less digits than its factorization.

191097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272 (or 1269 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 191097 is about 437.1464285568. The cubic root of 191097 is about 57.5993995886.

The spelling of 191097 in words is "one hundred ninety-one thousand, ninety-seven".