5621309 has 2 divisors, whose sum is σ = 5621310. Its totient is φ = 5621308.

The previous prime is 5621303. The next prime is 5621311. The reversal of 5621309 is 9031265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2815684 + 2805625 = 1678^2 + 1675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5621309 is a prime.

It is a super-2 number, since 2×5621309² = 63198229746962, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 5621311, it forms a pair of twin primes.

It is a Chen 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 (5621303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2810654 + 2810655.

It is an arithmetic number, because the mean of its divisors is an integer number (2810655).

Almost surely, 2^5621309 is an apocalyptic number.

It is an amenable number.

5621309 is a deficient number, since it is larger than the sum of its proper divisors (1).

5621309 is an equidigital number, since it uses as much as digits as its factorization.

5621309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 5621309 is about 2370.9299863134. The cubic root of 5621309 is about 177.8057574741.

The spelling of 5621309 in words is "five million, six hundred twenty-one thousand, three hundred nine".