191242191 has 8 divisors (see below), whose sum is σ = 291416704. Its totient is φ = 109281240.

The previous prime is 191242157. The next prime is 191242213.

It is a happy number.

191242191 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 191242191 - 2⁶ = 191242127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191242691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4553365 + ... + 4553406.

It is an arithmetic number, because the mean of its divisors is an integer number (36427088).

Almost surely, 2^191242191 is an apocalyptic number.

191242191 is a deficient number, since it is larger than the sum of its proper divisors (100174513).

191242191 is an equidigital number, since it uses as much as digits as its factorization.

191242191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9106781.

The product of its digits is 1296, while the sum is 30.

The square root of 191242191 is about 13829.0343480664. The cubic root of 191242191 is about 576.1398345153.

The spelling of 191242191 in words is "one hundred ninety-one million, two hundred forty-two thousand, one hundred ninety-one".