691136246593 has 16 divisors (see below), whose sum is σ = 789468135120. Its totient is φ = 599388788736.

The previous prime is 691136246569. The next prime is 691136246597. The reversal of 691136246593 is 395642631196.

It can be written as a sum of positive squares in 8 ways, for example, as 7981099569 + 683155147024 = 89337^2 + 826532^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691136246593 is a prime.

It is a super-2 number, since 2×691136246593² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691136246597) 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 in 15 ways as a sum of consecutive naturals, for example, 2622330 + ... + 2873827.

It is an arithmetic number, because the mean of its divisors is an integer number (49341758445).

Almost surely, 2^691136246593 is an apocalyptic number.

It is an amenable number.

691136246593 is a deficient number, since it is larger than the sum of its proper divisors (98331888527).

691136246593 is a wasteful number, since it uses less digits than its factorization.

691136246593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5496756.

The product of its digits is 6298560, while the sum is 55.

The spelling of 691136246593 in words is "six hundred ninety-one billion, one hundred thirty-six million, two hundred forty-six thousand, five hundred ninety-three".