191940555749 has 2 divisors, whose sum is σ = 191940555750. Its totient is φ = 191940555748.

The previous prime is 191940555733. The next prime is 191940555787. The reversal of 191940555749 is 947555049191.

191940555749 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 can be written as a sum of positive squares in only one way, i.e., 119261787649 + 72678768100 = 345343^2 + 269590^2 .

It is a cyclic number.

It is not a de Polignac number, because 191940555749 - 2⁴ = 191940555733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191940555449) 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, 95970277874 + 95970277875.

It is an arithmetic number, because the mean of its divisors is an integer number (95970277875).

Almost surely, 2^191940555749 is an apocalyptic number.

It is an amenable number.

191940555749 is a deficient number, since it is larger than the sum of its proper divisors (1).

191940555749 is an equidigital number, since it uses as much as digits as its factorization.

191940555749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206000, while the sum is 59.

The spelling of 191940555749 in words is "one hundred ninety-one billion, nine hundred forty million, five hundred fifty-five thousand, seven hundred forty-nine".