191055251 has 2 divisors, whose sum is σ = 191055252. Its totient is φ = 191055250.

The previous prime is 191055239. The next prime is 191055253. The reversal of 191055251 is 152550191.

191055251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191055251 - 2⁶ = 191055187 is a prime.

Together with 191055253, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191055253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95527625 + 95527626.

It is an arithmetic number, because the mean of its divisors is an integer number (95527626).

Almost surely, 2^191055251 is an apocalyptic number.

191055251 is a deficient number, since it is larger than the sum of its proper divisors (1).

191055251 is an equidigital number, since it uses as much as digits as its factorization.

191055251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 29.

The square root of 191055251 is about 13822.2737275746. The cubic root of 191055251 is about 575.9520469901.

The spelling of 191055251 in words is "one hundred ninety-one million, fifty-five thousand, two hundred fifty-one".