191242351 has 2 divisors, whose sum is σ = 191242352. Its totient is φ = 191242350.

The previous prime is 191242283. The next prime is 191242357. The reversal of 191242351 is 153242191.

191242351 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 an emirp because it is prime and its reverse (153242191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191242351 - 2⁷ = 191242223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191242357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95621175 + 95621176.

It is an arithmetic number, because the mean of its divisors is an integer number (95621176).

Almost surely, 2^191242351 is an apocalyptic number.

191242351 is a deficient number, since it is larger than the sum of its proper divisors (1).

191242351 is an equidigital number, since it uses as much as digits as its factorization.

191242351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 191242351 is about 13829.0401329955. The cubic root of 191242351 is about 576.1399951883.

The spelling of 191242351 in words is "one hundred ninety-one million, two hundred forty-two thousand, three hundred fifty-one".