8509121 has 2 divisors, whose sum is σ = 8509122. Its totient is φ = 8509120.

The previous prime is 8509091. The next prime is 8509133. The reversal of 8509121 is 1219058.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5340721 + 3168400 = 2311^2 + 1780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8509121 is a prime.

It is not a weakly prime, because it can be changed into another prime (8502121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4254560 + 4254561.

It is an arithmetic number, because the mean of its divisors is an integer number (4254561).

Almost surely, 2^8509121 is an apocalyptic number.

It is an amenable number.

8509121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8509121 is an equidigital number, since it uses as much as digits as its factorization.

8509121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 8509121 is about 2917.0397666127. The cubic root of 8509121 is about 204.1557266015.

The spelling of 8509121 in words is "eight million, five hundred nine thousand, one hundred twenty-one".