3101666221 has 2 divisors, whose sum is σ = 3101666222. Its totient is φ = 3101666220.

The previous prime is 3101666209. The next prime is 3101666299. The reversal of 3101666221 is 1226661013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2261478025 + 840188196 = 47555^2 + 28986^2 .

It is an emirp because it is prime and its reverse (1226661013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3101666221 - 2⁵ = 3101666189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3101666221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3101666621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1550833110 + 1550833111.

It is an arithmetic number, because the mean of its divisors is an integer number (1550833111).

Almost surely, 2^3101666221 is an apocalyptic number.

It is an amenable number.

3101666221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3101666221 is an equidigital number, since it uses as much as digits as its factorization.

3101666221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 3101666221 is about 55692.6047245054. The cubic root of 3101666221 is about 1458.3609273589.

The spelling of 3101666221 in words is "three billion, one hundred one million, six hundred sixty-six thousand, two hundred twenty-one".