691734059831 has 2 divisors, whose sum is σ = 691734059832. Its totient is φ = 691734059830.

The previous prime is 691734059813. The next prime is 691734059897. The reversal of 691734059831 is 138950437196.

Together with previous prime (691734059813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691734059831 - 2³⁸ = 416856152887 is a prime.

It is a super-2 number, since 2×691734059831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691734059131) 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, 345867029915 + 345867029916.

It is an arithmetic number, because the mean of its divisors is an integer number (345867029916).

Almost surely, 2^691734059831 is an apocalyptic number.

691734059831 is a deficient number, since it is larger than the sum of its proper divisors (1).

691734059831 is an equidigital number, since it uses as much as digits as its factorization.

691734059831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The spelling of 691734059831 in words is "six hundred ninety-one billion, seven hundred thirty-four million, fifty-nine thousand, eight hundred thirty-one".