8021969 has 2 divisors, whose sum is σ = 8021970. Its totient is φ = 8021968.

The previous prime is 8021941. The next prime is 8021989. The reversal of 8021969 is 9691208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6838225 + 1183744 = 2615^2 + 1088^2 .

It is a cyclic number.

It is not a de Polignac number, because 8021969 - 2¹² = 8017873 is a prime.

It is a super-2 number, since 2×8021969² = 128703973273922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8021939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4010984 + 4010985.

It is an arithmetic number, because the mean of its divisors is an integer number (4010985).

Almost surely, 2^8021969 is an apocalyptic number.

It is an amenable number.

8021969 is a deficient number, since it is larger than the sum of its proper divisors (1).

8021969 is an equidigital number, since it uses as much as digits as its factorization.

8021969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 8021969 is about 2832.3080694021. The cubic root of 8021969 is about 200.1829076729.

The spelling of 8021969 in words is "eight million, twenty-one thousand, nine hundred sixty-nine".