694900009 has 2 divisors, whose sum is σ = 694900010. Its totient is φ = 694900008.

The previous prime is 694899979. The next prime is 694900049. The reversal of 694900009 is 900009496.

694900009 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., 545082409 + 149817600 = 23347^2 + 12240^2 .

It is a cyclic number.

It is not a de Polignac number, because 694900009 - 2²¹ = 692802857 is a prime.

It is not a weakly prime, because it can be changed into another prime (694900049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347450004 + 347450005.

It is an arithmetic number, because the mean of its divisors is an integer number (347450005).

Almost surely, 2^694900009 is an apocalyptic number.

It is an amenable number.

694900009 is a deficient number, since it is larger than the sum of its proper divisors (1).

694900009 is an equidigital number, since it uses as much as digits as its factorization.

694900009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 694900009 is about 26360.9561473024. The cubic root of 694900009 is about 885.7424091548.

The spelling of 694900009 in words is "six hundred ninety-four million, nine hundred thousand, nine".