191440276649 has 2 divisors, whose sum is σ = 191440276650. Its totient is φ = 191440276648.

The previous prime is 191440276613. The next prime is 191440276673. The reversal of 191440276649 is 946672044191.

191440276649 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., 177173646400 + 14266630249 = 420920^2 + 119443^2 .

It is a cyclic number.

It is not a de Polignac number, because 191440276649 - 2²⁰ = 191439228073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191440276649.

It is not a weakly prime, because it can be changed into another prime (191440276549) 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, 95720138324 + 95720138325.

It is an arithmetic number, because the mean of its divisors is an integer number (95720138325).

Almost surely, 2^191440276649 is an apocalyptic number.

It is an amenable number.

191440276649 is a deficient number, since it is larger than the sum of its proper divisors (1).

191440276649 is an equidigital number, since it uses as much as digits as its factorization.

191440276649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 53.

The spelling of 191440276649 in words is "one hundred ninety-one billion, four hundred forty million, two hundred seventy-six thousand, six hundred forty-nine".