694781 has 2 divisors, whose sum is σ = 694782. Its totient is φ = 694780.

The previous prime is 694763. The next prime is 694783. The reversal of 694781 is 187496.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538756 + 156025 = 734^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 694781 - 2⁶ = 694717 is a prime.

It is a super-2 number, since 2×694781² = 965441275922, which contains 22 as substring.

Together with 694783, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

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 694781.

It is not a weakly prime, because it can be changed into another prime (694783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347390 + 347391.

It is an arithmetic number, because the mean of its divisors is an integer number (347391).

2⁶⁹⁴⁷⁸¹ is an apocalyptic number.

It is an amenable number.

694781 is a deficient number, since it is larger than the sum of its proper divisors (1).

694781 is an equidigital number, since it uses as much as digits as its factorization.

694781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 694781 is about 833.5352422064. The cubic root of 694781 is about 88.5691842006.

The spelling of 694781 in words is "six hundred ninety-four thousand, seven hundred eighty-one".