8421697 has 2 divisors, whose sum is σ = 8421698. Its totient is φ = 8421696.

The previous prime is 8421653. The next prime is 8421701. The reversal of 8421697 is 7961248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7096896 + 1324801 = 2664^2 + 1151^2 .

It is a cyclic number.

It is not a de Polignac number, because 8421697 - 2¹⁵ = 8388929 is a prime.

It is a d-powerful number, because it can be written as 8⁵ + 4⁴ + 2²³ + 1 + 6 + 9 + 7² .

It is not a weakly prime, because it can be changed into another prime (8424697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210848 + 4210849.

It is an arithmetic number, because the mean of its divisors is an integer number (4210849).

Almost surely, 2^8421697 is an apocalyptic number.

It is an amenable number.

8421697 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421697 is an equidigital number, since it uses as much as digits as its factorization.

8421697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 37.

The square root of 8421697 is about 2902.0160233879. The cubic root of 8421697 is about 203.4541427257.

The spelling of 8421697 in words is "eight million, four hundred twenty-one thousand, six hundred ninety-seven".