191047126987 has 2 divisors, whose sum is σ = 191047126988. Its totient is φ = 191047126986.

The previous prime is 191047126951. The next prime is 191047127059. The reversal of 191047126987 is 789621740191.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191047126987 - 2¹⁵ = 191047094219 is a prime.

It is not a weakly prime, because it can be changed into another prime (191047120987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95523563493 + 95523563494.

It is an arithmetic number, because the mean of its divisors is an integer number (95523563494).

Almost surely, 2^191047126987 is an apocalyptic number.

191047126987 is a deficient number, since it is larger than the sum of its proper divisors (1).

191047126987 is an equidigital number, since it uses as much as digits as its factorization.

191047126987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 191047126987 in words is "one hundred ninety-one billion, forty-seven million, one hundred twenty-six thousand, nine hundred eighty-seven".