191255071 has 4 divisors (see below), whose sum is σ = 218577232. Its totient is φ = 163932912.

The previous prime is 191255033. The next prime is 191255101. The reversal of 191255071 is 170552191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 170552191 = 109 ⋅1564699.

It is a cyclic number.

It is not a de Polignac number, because 191255071 - 2⁹ = 191254559 is a prime.

It is the 13830-th Hogben 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 (191255171) by changing a digit.

It is a nontrivial repunit in base 13829.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13661070 + ... + 13661083.

It is an arithmetic number, because the mean of its divisors is an integer number (54644308).

Almost surely, 2^191255071 is an apocalyptic number.

191255071 is a deficient number, since it is larger than the sum of its proper divisors (27322161).

191255071 is an equidigital number, since it uses as much as digits as its factorization.

191255071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27322160.

The product of its (nonzero) digits is 3150, while the sum is 31.

The square root of 191255071 is about 13829.5000271159. The cubic root of 191255071 is about 576.1527684020.

The spelling of 191255071 in words is "one hundred ninety-one million, two hundred fifty-five thousand, seventy-one".