191064648487 has 2 divisors, whose sum is σ = 191064648488. Its totient is φ = 191064648486.

The previous prime is 191064648443. The next prime is 191064648491. The reversal of 191064648487 is 784846460191.

It is a strong prime.

It is an emirp because it is prime and its reverse (784846460191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191064648487 - 2¹¹ = 191064646439 is a prime.

It is a super-3 number, since 3×191064648487³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191064648427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95532324243 + 95532324244.

It is an arithmetic number, because the mean of its divisors is an integer number (95532324244).

Almost surely, 2^191064648487 is an apocalyptic number.

191064648487 is a deficient number, since it is larger than the sum of its proper divisors (1).

191064648487 is an equidigital number, since it uses as much as digits as its factorization.

191064648487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9289728, while the sum is 58.

The spelling of 191064648487 in words is "one hundred ninety-one billion, sixty-four million, six hundred forty-eight thousand, four hundred eighty-seven".