191303841557 has 2 divisors, whose sum is σ = 191303841558. Its totient is φ = 191303841556.

The previous prime is 191303841523. The next prime is 191303841583. The reversal of 191303841557 is 755148303191.

191303841557 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., 187115939761 + 4187901796 = 432569^2 + 64714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191303841557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191303841857) 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, 95651920778 + 95651920779.

It is an arithmetic number, because the mean of its divisors is an integer number (95651920779).

Almost surely, 2^191303841557 is an apocalyptic number.

It is an amenable number.

191303841557 is a deficient number, since it is larger than the sum of its proper divisors (1).

191303841557 is an equidigital number, since it uses as much as digits as its factorization.

191303841557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 191303841557 in words is "one hundred ninety-one billion, three hundred three million, eight hundred forty-one thousand, five hundred fifty-seven".