191368087 has 2 divisors, whose sum is σ = 191368088. Its totient is φ = 191368086.

The previous prime is 191368081. The next prime is 191368097. The reversal of 191368087 is 780863191.

191368087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191368087 - 2¹⁹ = 190843799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191368081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95684043 + 95684044.

It is an arithmetic number, because the mean of its divisors is an integer number (95684044).

Almost surely, 2^191368087 is an apocalyptic number.

191368087 is a deficient number, since it is larger than the sum of its proper divisors (1).

191368087 is an equidigital number, since it uses as much as digits as its factorization.

191368087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 191368087 is about 13833.5854715977. The cubic root of 191368087 is about 576.2662323386.

The spelling of 191368087 in words is "one hundred ninety-one million, three hundred sixty-eight thousand, eighty-seven".