694081 has 2 divisors, whose sum is σ = 694082. Its totient is φ = 694080.

The previous prime is 694079. The next prime is 694087. The reversal of 694081 is 180496.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680625 + 13456 = 825^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 694081 - 2¹ = 694079 is a prime.

It is a super-2 number, since 2×694081² = 963496869122, which contains 22 as substring.

Together with 694079, it forms a pair of twin primes.

It is an Ulam number.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (694087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347040 + 347041.

It is an arithmetic number, because the mean of its divisors is an integer number (347041).

2⁶⁹⁴⁰⁸¹ is an apocalyptic number.

It is an amenable number.

694081 is a deficient number, since it is larger than the sum of its proper divisors (1).

694081 is an equidigital number, since it uses as much as digits as its factorization.

694081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 694081 is about 833.1152381274. The cubic root of 694081 is about 88.5394293752.

It can be divided in two parts, 6940 and 81, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 694081 in words is "six hundred ninety-four thousand, eighty-one".