191235851 has 2 divisors, whose sum is σ = 191235852. Its totient is φ = 191235850.

The previous prime is 191235833. The next prime is 191235859. The reversal of 191235851 is 158532191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191235851 - 2²⁶ = 124126987 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191235859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95617925 + 95617926.

It is an arithmetic number, because the mean of its divisors is an integer number (95617926).

Almost surely, 2^191235851 is an apocalyptic number.

191235851 is a deficient number, since it is larger than the sum of its proper divisors (1).

191235851 is an equidigital number, since it uses as much as digits as its factorization.

191235851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 35.

The square root of 191235851 is about 13828.8051183029. The cubic root of 191235851 is about 576.1334677771.

The spelling of 191235851 in words is "one hundred ninety-one million, two hundred thirty-five thousand, eight hundred fifty-one".