191896520269 has 2 divisors, whose sum is σ = 191896520270. Its totient is φ = 191896520268.

The previous prime is 191896520213. The next prime is 191896520303. The reversal of 191896520269 is 962025698191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164197575369 + 27698944900 = 405213^2 + 166430^2 .

It is a cyclic number.

It is not a de Polignac number, because 191896520269 - 2⁹ = 191896519757 is a prime.

It is a super-2 number, since 2×191896520269² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191896520369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95948260134 + 95948260135.

It is an arithmetic number, because the mean of its divisors is an integer number (95948260135).

Almost surely, 2^191896520269 is an apocalyptic number.

It is an amenable number.

191896520269 is a deficient number, since it is larger than the sum of its proper divisors (1).

191896520269 is an equidigital number, since it uses as much as digits as its factorization.

191896520269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 58.

The spelling of 191896520269 in words is "one hundred ninety-one billion, eight hundred ninety-six million, five hundred twenty thousand, two hundred sixty-nine".