191369 has 4 divisors (see below), whose sum is σ = 202644. Its totient is φ = 180096.

The previous prime is 191353. The next prime is 191413. The reversal of 191369 is 963191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 156025 + 35344 = 395^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 191369 - 2⁴ = 191353 is a prime.

It is a super-2 number, since 2×191369² = 73244188322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 191369.

It is not an unprimeable number, because it can be changed into a prime (191339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5612 + ... + 5645.

It is an arithmetic number, because the mean of its divisors is an integer number (50661).

2¹⁹¹³⁶⁹ is an apocalyptic number.

It is an amenable number.

191369 is a deficient number, since it is larger than the sum of its proper divisors (11275).

191369 is a wasteful number, since it uses less digits than its factorization.

191369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11274.

The product of its digits is 1458, while the sum is 29.

The square root of 191369 is about 437.4574265000. The cubic root of 191369 is about 57.6267148775.

The spelling of 191369 in words is "one hundred ninety-one thousand, three hundred sixty-nine".