693689 has 2 divisors, whose sum is σ = 693690. Its totient is φ = 693688.

The previous prime is 693683. The next prime is 693691. The reversal of 693689 is 986396.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409600 + 284089 = 640^2 + 533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-693689 is a prime.

Together with 693691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (693683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346844 + 346845.

It is an arithmetic number, because the mean of its divisors is an integer number (346845).

2⁶⁹³⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

693689 is a deficient number, since it is larger than the sum of its proper divisors (1).

693689 is an equidigital number, since it uses as much as digits as its factorization.

693689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 41.

The square root of 693689 is about 832.8799433292. The cubic root of 693689 is about 88.5227579337.

It can be divided in two parts, 69 and 3689, that multiplied together give a triangular number (254541 = T₇₁₃).

The spelling of 693689 in words is "six hundred ninety-three thousand, six hundred eighty-nine".