8011621 has 2 divisors, whose sum is σ = 8011622. Its totient is φ = 8011620.

The previous prime is 8011589. The next prime is 8011643. The reversal of 8011621 is 1261108.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7918596 + 93025 = 2814^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 8011621 - 2⁵ = 8011589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8011651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4005810 + 4005811.

It is an arithmetic number, because the mean of its divisors is an integer number (4005811).

Almost surely, 2^8011621 is an apocalyptic number.

It is an amenable number.

8011621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8011621 is an equidigital number, since it uses as much as digits as its factorization.

8011621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 8011621 is about 2830.4807012237. The cubic root of 8011621 is about 200.0967948129.

Adding to 8011621 its reverse (1261108), we get a palindrome (9272729).

The spelling of 8011621 in words is "eight million, eleven thousand, six hundred twenty-one".