3613649813 has 2 divisors, whose sum is σ = 3613649814. Its totient is φ = 3613649812.

The previous prime is 3613649783. The next prime is 3613649827. The reversal of 3613649813 is 3189463163.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3156417124 + 457232689 = 56182^2 + 21383^2 .

It is a cyclic number.

It is not a de Polignac number, because 3613649813 - 2⁶ = 3613649749 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 (3613649833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1806824906 + 1806824907.

It is an arithmetic number, because the mean of its divisors is an integer number (1806824907).

Almost surely, 2^3613649813 is an apocalyptic number.

It is an amenable number.

3613649813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3613649813 is an equidigital number, since it uses as much as digits as its factorization.

3613649813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The square root of 3613649813 is about 60113.6408230278. The cubic root of 3613649813 is about 1534.5534551867.

The spelling of 3613649813 in words is "three billion, six hundred thirteen million, six hundred forty-nine thousand, eight hundred thirteen".