673406681 has 2 divisors, whose sum is σ = 673406682. Its totient is φ = 673406680.

The previous prime is 673406659. The next prime is 673406729. The reversal of 673406681 is 186604376.

673406681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504406681 + 169000000 = 22459^2 + 13000^2 .

It is a cyclic number.

It is not a de Polignac number, because 673406681 - 2²⁶ = 606297817 is a prime.

It is a super-2 number, since 2×673406681² = 906953116030871522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (673406621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336703340 + 336703341.

It is an arithmetic number, because the mean of its divisors is an integer number (336703341).

Almost surely, 2^673406681 is an apocalyptic number.

It is an amenable number.

673406681 is a deficient number, since it is larger than the sum of its proper divisors (1).

673406681 is an equidigital number, since it uses as much as digits as its factorization.

673406681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 673406681 is about 25950.0805586418. The cubic root of 673406681 is about 876.5145713064.

The spelling of 673406681 in words is "six hundred seventy-three million, four hundred six thousand, six hundred eighty-one".