691136246597 has 2 divisors, whose sum is σ = 691136246598. Its totient is φ = 691136246596.

The previous prime is 691136246569. The next prime is 691136246599. The reversal of 691136246597 is 795642631196.

691136246597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 684931691236 + 6204555361 = 827606^2 + 78769^2 .

It is a cyclic number.

It is not a de Polignac number, because 691136246597 - 2²² = 691132052293 is a prime.

It is a super-2 number, since 2×691136246597² (a number of 24 digits) contains 22 as substring.

Together with 691136246599, 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 (691136246599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345568123298 + 345568123299.

It is an arithmetic number, because the mean of its divisors is an integer number (345568123299).

Almost surely, 2^691136246597 is an apocalyptic number.

It is an amenable number.

691136246597 is a deficient number, since it is larger than the sum of its proper divisors (1).

691136246597 is an equidigital number, since it uses as much as digits as its factorization.

691136246597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 59.

The spelling of 691136246597 in words is "six hundred ninety-one billion, one hundred thirty-six million, two hundred forty-six thousand, five hundred ninety-seven".