691727 has 2 divisors, whose sum is σ = 691728. Its totient is φ = 691726.

The previous prime is 691723. The next prime is 691729. The reversal of 691727 is 727196.

691727 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 is a cyclic number.

It is not a de Polignac number, because 691727 - 2² = 691723 is a prime.

Together with 691729, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 691693 and 691702.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 691727.

It is not a weakly prime, because it can be changed into another prime (691721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345863 + 345864.

It is an arithmetic number, because the mean of its divisors is an integer number (345864).

2⁶⁹¹⁷²⁷ is an apocalyptic number.

691727 is a deficient number, since it is larger than the sum of its proper divisors (1).

691727 is an equidigital number, since it uses as much as digits as its factorization.

691727 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 32.

The square root of 691727 is about 831.7012684853. The cubic root of 691727 is about 88.4392211454.

The spelling of 691727 in words is "six hundred ninety-one thousand, seven hundred twenty-seven".