3686695121 has 2 divisors, whose sum is σ = 3686695122. Its totient is φ = 3686695120.

The previous prime is 3686695109. The next prime is 3686695147. The reversal of 3686695121 is 1215966863.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3597600400 + 89094721 = 59980^2 + 9439^2 .

It is a cyclic number.

It is not a de Polignac number, because 3686695121 - 2²² = 3682500817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3686695321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1843347560 + 1843347561.

It is an arithmetic number, because the mean of its divisors is an integer number (1843347561).

Almost surely, 2^3686695121 is an apocalyptic number.

It is an amenable number.

3686695121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3686695121 is an equidigital number, since it uses as much as digits as its factorization.

3686695121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 47.

The square root of 3686695121 is about 60718.1613769719. The cubic root of 3686695121 is about 1544.8242376765.

The spelling of 3686695121 in words is "three billion, six hundred eighty-six million, six hundred ninety-five thousand, one hundred twenty-one".