691489172327 has 2 divisors, whose sum is σ = 691489172328. Its totient is φ = 691489172326.

The previous prime is 691489172321. The next prime is 691489172371. The reversal of 691489172327 is 723271984196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691489172327 - 2¹⁸ = 691488910183 is a prime.

It is a super-3 number, since 3×691489172327³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691489172321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345744586163 + 345744586164.

It is an arithmetic number, because the mean of its divisors is an integer number (345744586164).

Almost surely, 2^691489172327 is an apocalyptic number.

691489172327 is a deficient number, since it is larger than the sum of its proper divisors (1).

691489172327 is an equidigital number, since it uses as much as digits as its factorization.

691489172327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The spelling of 691489172327 in words is "six hundred ninety-one billion, four hundred eighty-nine million, one hundred seventy-two thousand, three hundred twenty-seven".