191559 has 4 divisors (see below), whose sum is σ = 255416. Its totient is φ = 127704.

The previous prime is 191551. The next prime is 191561. The reversal of 191559 is 955191.

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

It is not a de Polignac number, because 191559 - 2³ = 191551 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191551) 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, 31924 + ... + 31929.

It is an arithmetic number, because the mean of its divisors is an integer number (63854).

2¹⁹¹⁵⁵⁹ is an apocalyptic number.

191559 is a deficient number, since it is larger than the sum of its proper divisors (63857).

191559 is an equidigital number, since it uses as much as digits as its factorization.

191559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63856.

The product of its digits is 2025, while the sum is 30.

The square root of 191559 is about 437.6745366137. The cubic root of 191559 is about 57.6457800592.

The spelling of 191559 in words is "one hundred ninety-one thousand, five hundred fifty-nine".