13247621 has 2 divisors, whose sum is σ = 13247622. Its totient is φ = 13247620.

The previous prime is 13247603. The next prime is 13247623. The reversal of 13247621 is 12674231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10982596 + 2265025 = 3314^2 + 1505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13247621 is a prime.

Together with 13247623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13247623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6623810 + 6623811.

It is an arithmetic number, because the mean of its divisors is an integer number (6623811).

Almost surely, 2^13247621 is an apocalyptic number.

It is an amenable number.

13247621 is a deficient number, since it is larger than the sum of its proper divisors (1).

13247621 is an equidigital number, since it uses as much as digits as its factorization.

13247621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 13247621 is about 3639.7281491892. The cubic root of 13247621 is about 236.6170115579.

The spelling of 13247621 in words is "thirteen million, two hundred forty-seven thousand, six hundred twenty-one".