693691 has 2 divisors, whose sum is σ = 693692. Its totient is φ = 693690.

The previous prime is 693689. The next prime is 693697. The reversal of 693691 is 196396.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 693691 - 2¹ = 693689 is a prime.

Together with 693689, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (693697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346845 + 346846.

It is an arithmetic number, because the mean of its divisors is an integer number (346846).

2⁶⁹³⁶⁹¹ is an apocalyptic number.

693691 is a deficient number, since it is larger than the sum of its proper divisors (1).

693691 is an equidigital number, since it uses as much as digits as its factorization.

693691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 34.

The square root of 693691 is about 832.8811439815. The cubic root of 693691 is about 88.5228430080.

The spelling of 693691 in words is "six hundred ninety-three thousand, six hundred ninety-one".