3621685813 has 2 divisors, whose sum is σ = 3621685814. Its totient is φ = 3621685812.

The previous prime is 3621685787. The next prime is 3621685829. The reversal of 3621685813 is 3185861263.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2487814884 + 1133870929 = 49878^2 + 33673^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621685813 - 2¹³ = 3621677621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3621685813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3621685883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810842906 + 1810842907.

It is an arithmetic number, because the mean of its divisors is an integer number (1810842907).

Almost surely, 2^3621685813 is an apocalyptic number.

It is an amenable number.

3621685813 is a deficient number, since it is larger than the sum of its proper divisors (1).

3621685813 is an equidigital number, since it uses as much as digits as its factorization.

3621685813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 3621685813 is about 60180.4437753661. The cubic root of 3621685813 is about 1535.6901214809.

The spelling of 3621685813 in words is "three billion, six hundred twenty-one million, six hundred eighty-five thousand, eight hundred thirteen".