8779621 has 2 divisors, whose sum is σ = 8779622. Its totient is φ = 8779620.

The previous prime is 8779607. The next prime is 8779703. The reversal of 8779621 is 1269778.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8767521 + 12100 = 2961^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 8779621 - 2⁷ = 8779493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8779321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4389810 + 4389811.

It is an arithmetic number, because the mean of its divisors is an integer number (4389811).

Almost surely, 2^8779621 is an apocalyptic number.

It is an amenable number.

8779621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8779621 is an equidigital number, since it uses as much as digits as its factorization.

8779621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 8779621 is about 2963.0425241633. The cubic root of 8779621 is about 206.2965299367.

The spelling of 8779621 in words is "eight million, seven hundred seventy-nine thousand, six hundred twenty-one".