97809076691 has 2 divisors, whose sum is σ = 97809076692. Its totient is φ = 97809076690.

The previous prime is 97809076661. The next prime is 97809076693. The reversal of 97809076691 is 19667090879.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97809076691 is a prime.

Together with 97809076693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97809076693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48904538345 + 48904538346.

It is an arithmetic number, because the mean of its divisors is an integer number (48904538346).

Almost surely, 2^97809076691 is an apocalyptic number.

97809076691 is a deficient number, since it is larger than the sum of its proper divisors (1).

97809076691 is an equidigital number, since it uses as much as digits as its factorization.

97809076691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10287648, while the sum is 62.

The spelling of 97809076691 in words is "ninety-seven billion, eight hundred nine million, seventy-six thousand, six hundred ninety-one".