694391 has 2 divisors, whose sum is σ = 694392. Its totient is φ = 694390.

The previous prime is 694387. The next prime is 694409. The reversal of 694391 is 193496.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 694391 - 2² = 694387 is a prime.

It is a nialpdrome in base 16.

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 694391.

It is not a weakly prime, because it can be changed into another prime (694361) 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, 347195 + 347196.

It is an arithmetic number, because the mean of its divisors is an integer number (347196).

2⁶⁹⁴³⁹¹ is an apocalyptic number.

694391 is a deficient number, since it is larger than the sum of its proper divisors (1).

694391 is an equidigital number, since it uses as much as digits as its factorization.

694391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 32.

The square root of 694391 is about 833.3012660497. The cubic root of 694391 is about 88.5526089791.

The spelling of 694391 in words is "six hundred ninety-four thousand, three hundred ninety-one".