8421529 has 2 divisors, whose sum is σ = 8421530. Its totient is φ = 8421528.

The previous prime is 8421509. The next prime is 8421547. The reversal of 8421529 is 9251248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8277129 + 144400 = 2877^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 8421529 - 2¹⁵ = 8388761 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 8⁵ + 4² + 2 + 1 + 5³ + 2²³ + 9 .

It is a self number, because there is not a number n which added to its sum of digits gives 8421529.

It is not a weakly prime, because it can be changed into another prime (8421509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210764 + 4210765.

It is an arithmetic number, because the mean of its divisors is an integer number (4210765).

Almost surely, 2^8421529 is an apocalyptic number.

It is an amenable number.

8421529 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421529 is an equidigital number, since it uses as much as digits as its factorization.

8421529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 8421529 is about 2901.9870778486. The cubic root of 8421529 is about 203.4527898502.

The spelling of 8421529 in words is "eight million, four hundred twenty-one thousand, five hundred twenty-nine".