8719021 has 2 divisors, whose sum is σ = 8719022. Its totient is φ = 8719020.

The previous prime is 8719003. The next prime is 8719031. The reversal of 8719021 is 1209178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7128900 + 1590121 = 2670^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 8719021 - 2¹³ = 8710829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8719031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4359510 + 4359511.

It is an arithmetic number, because the mean of its divisors is an integer number (4359511).

Almost surely, 2^8719021 is an apocalyptic number.

It is an amenable number.

8719021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8719021 is an equidigital number, since it uses as much as digits as its factorization.

8719021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 8719021 is about 2952.7988417771. The cubic root of 8719021 is about 205.8207901936.

The spelling of 8719021 in words is "eight million, seven hundred nineteen thousand, twenty-one".