3109621 has 2 divisors, whose sum is σ = 3109622. Its totient is φ = 3109620.

The previous prime is 3109619. The next prime is 3109633. The reversal of 3109621 is 1269013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1703025 + 1406596 = 1305^2 + 1186^2 .

It is an emirp because it is prime and its reverse (1269013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3109621 - 2¹ = 3109619 is a prime.

Together with 3109619, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3109592 and 3109601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3109651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1554810 + 1554811.

It is an arithmetic number, because the mean of its divisors is an integer number (1554811).

Almost surely, 2^3109621 is an apocalyptic number.

It is an amenable number.

3109621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3109621 is an equidigital number, since it uses as much as digits as its factorization.

3109621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 3109621 is about 1763.4117499892. The cubic root of 3109621 is about 145.9606605713.

The spelling of 3109621 in words is "three million, one hundred nine thousand, six hundred twenty-one".