191487966793 has 2 divisors, whose sum is σ = 191487966794. Its totient is φ = 191487966792.

The previous prime is 191487966749. The next prime is 191487966829. The reversal of 191487966793 is 397669784191.

191487966793 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 can be written as a sum of positive squares in only one way, i.e., 189993989689 + 1493977104 = 435883^2 + 38652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191487966793 is a prime.

It is a super-3 number, since 3×191487966793³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (191487966713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95743983396 + 95743983397.

It is an arithmetic number, because the mean of its divisors is an integer number (95743983397).

Almost surely, 2^191487966793 is an apocalyptic number.

It is an amenable number.

191487966793 is a deficient number, since it is larger than the sum of its proper divisors (1).

191487966793 is an equidigital number, since it uses as much as digits as its factorization.

191487966793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123451776, while the sum is 70.

The spelling of 191487966793 in words is "one hundred ninety-one billion, four hundred eighty-seven million, nine hundred sixty-six thousand, seven hundred ninety-three".