691734016109 has 2 divisors, whose sum is σ = 691734016110. Its totient is φ = 691734016108.

The previous prime is 691734016087. The next prime is 691734016111. The reversal of 691734016109 is 901610437196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 614961798025 + 76772218084 = 784195^2 + 277078^2 .

It is a cyclic number.

It is not a de Polignac number, because 691734016109 - 2⁸ = 691734015853 is a prime.

Together with 691734016111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691734016189) 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, 345867008054 + 345867008055.

It is an arithmetic number, because the mean of its divisors is an integer number (345867008055).

Almost surely, 2^691734016109 is an apocalyptic number.

It is an amenable number.

691734016109 is a deficient number, since it is larger than the sum of its proper divisors (1).

691734016109 is an equidigital number, since it uses as much as digits as its factorization.

691734016109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 244944, while the sum is 47.

The spelling of 691734016109 in words is "six hundred ninety-one billion, seven hundred thirty-four million, sixteen thousand, one hundred nine".