3636006821 has 2 divisors, whose sum is σ = 3636006822. Its totient is φ = 3636006820.

The previous prime is 3636006817. The next prime is 3636006827. The reversal of 3636006821 is 1286006363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2610085921 + 1025920900 = 51089^2 + 32030^2 .

It is a cyclic number.

It is not a de Polignac number, because 3636006821 - 2² = 3636006817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3636006827) 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, 1818003410 + 1818003411.

It is an arithmetic number, because the mean of its divisors is an integer number (1818003411).

Almost surely, 2^3636006821 is an apocalyptic number.

It is an amenable number.

3636006821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3636006821 is an equidigital number, since it uses as much as digits as its factorization.

3636006821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 3636006821 is about 60299.3102862711. The cubic root of 3636006821 is about 1537.7116207798.

The spelling of 3636006821 in words is "three billion, six hundred thirty-six million, six thousand, eight hundred twenty-one".