8623621 has 2 divisors, whose sum is σ = 8623622. Its totient is φ = 8623620.

The previous prime is 8623619. The next prime is 8623639. The reversal of 8623621 is 1263268.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5522500 + 3101121 = 2350^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 8623621 - 2¹ = 8623619 is a prime.

Together with 8623619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 8623621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8623651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4311810 + 4311811.

It is an arithmetic number, because the mean of its divisors is an integer number (4311811).

Almost surely, 2^8623621 is an apocalyptic number.

It is an amenable number.

8623621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8623621 is an equidigital number, since it uses as much as digits as its factorization.

8623621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 8623621 is about 2936.6002451815. The cubic root of 8623621 is about 205.0673663192.

Adding to 8623621 its reverse (1263268), we get a palindrome (9886889).

The spelling of 8623621 in words is "eight million, six hundred twenty-three thousand, six hundred twenty-one".