191468214809 has 2 divisors, whose sum is σ = 191468214810. Its totient is φ = 191468214808.

The previous prime is 191468214787. The next prime is 191468214827. The reversal of 191468214809 is 908412864191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185812723600 + 5655491209 = 431060^2 + 75203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191468214809 is a prime.

It is not a weakly prime, because it can be changed into another prime (191468214859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95734107404 + 95734107405.

It is an arithmetic number, because the mean of its divisors is an integer number (95734107405).

Almost surely, 2^191468214809 is an apocalyptic number.

It is an amenable number.

191468214809 is a deficient number, since it is larger than the sum of its proper divisors (1).

191468214809 is an equidigital number, since it uses as much as digits as its factorization.

191468214809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 53.

The spelling of 191468214809 in words is "one hundred ninety-one billion, four hundred sixty-eight million, two hundred fourteen thousand, eight hundred nine".