191281628833277 has 2 divisors, whose sum is σ = 191281628833278. Its totient is φ = 191281628833276.

The previous prime is 191281628833247. The next prime is 191281628833417. The reversal of 191281628833277 is 772338826182191.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127636240259641 + 63645388573636 = 11297621^2 + 7977806^2 .

It is an emirp because it is prime and its reverse (772338826182191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191281628833277 - 2¹⁴ = 191281628816893 is a prime.

It is a super-2 number, since 2×191281628833277² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191281628833247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95640814416638 + 95640814416639.

It is an arithmetic number, because the mean of its divisors is an integer number (95640814416639).

Almost surely, 2^{191281628833277} is an apocalyptic number.

It is an amenable number.

191281628833277 is a deficient number, since it is larger than the sum of its proper divisors (1).

191281628833277 is an equidigital number, since it uses as much as digits as its factorization.

191281628833277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97542144, while the sum is 68.

The spelling of 191281628833277 in words is "one hundred ninety-one trillion, two hundred eighty-one billion, six hundred twenty-eight million, eight hundred thirty-three thousand, two hundred seventy-seven".