3806516621 has 2 divisors, whose sum is σ = 3806516622. Its totient is φ = 3806516620.

The previous prime is 3806516617. The next prime is 3806516683. The reversal of 3806516621 is 1266156083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2493903721 + 1312612900 = 49939^2 + 36230^2 .

It is a cyclic number.

It is not a de Polignac number, because 3806516621 - 2² = 3806516617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3806516611) 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, 1903258310 + 1903258311.

It is an arithmetic number, because the mean of its divisors is an integer number (1903258311).

Almost surely, 2^3806516621 is an apocalyptic number.

It is an amenable number.

3806516621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3806516621 is an equidigital number, since it uses as much as digits as its factorization.

3806516621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 3806516621 is about 61696.9741640544. The cubic root of 3806516621 is about 1561.3822699461.

The spelling of 3806516621 in words is "three billion, eight hundred six million, five hundred sixteen thousand, six hundred twenty-one".