65215121 has 2 divisors, whose sum is σ = 65215122. Its totient is φ = 65215120.

The previous prime is 65215099. The next prime is 65215141. The reversal of 65215121 is 12151256.

It is a happy number.

65215121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62980096 + 2235025 = 7936^2 + 1495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65215121 is a prime.

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 (65215141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32607560 + 32607561.

It is an arithmetic number, because the mean of its divisors is an integer number (32607561).

Almost surely, 2^65215121 is an apocalyptic number.

It is an amenable number.

65215121 is a deficient number, since it is larger than the sum of its proper divisors (1).

65215121 is an equidigital number, since it uses as much as digits as its factorization.

65215121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 23.

The square root of 65215121 is about 8075.5879662103. The cubic root of 65215121 is about 402.5156477077.

Adding to 65215121 its reverse (12151256), we get a palindrome (77366377).

The spelling of 65215121 in words is "sixty-five million, two hundred fifteen thousand, one hundred twenty-one".