191764008097 has 2 divisors, whose sum is σ = 191764008098. Its totient is φ = 191764008096.

The previous prime is 191764008077. The next prime is 191764008119. The reversal of 191764008097 is 790800467191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155649186576 + 36114821521 = 394524^2 + 190039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191764008097 is a prime.

It is a super-2 number, since 2×191764008097² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191764008047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95882004048 + 95882004049.

It is an arithmetic number, because the mean of its divisors is an integer number (95882004049).

Almost surely, 2^191764008097 is an apocalyptic number.

It is an amenable number.

191764008097 is a deficient number, since it is larger than the sum of its proper divisors (1).

191764008097 is an equidigital number, since it uses as much as digits as its factorization.

191764008097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 52.

The spelling of 191764008097 in words is "one hundred ninety-one billion, seven hundred sixty-four million, eight thousand, ninety-seven".