65506121 has 2 divisors, whose sum is σ = 65506122. Its totient is φ = 65506120.

The previous prime is 65506081. The next prime is 65506153. The reversal of 65506121 is 12160556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61011721 + 4494400 = 7811^2 + 2120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65506121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65506171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32753060 + 32753061.

It is an arithmetic number, because the mean of its divisors is an integer number (32753061).

Almost surely, 2^65506121 is an apocalyptic number.

It is an amenable number.

65506121 is a deficient number, since it is larger than the sum of its proper divisors (1).

65506121 is an equidigital number, since it uses as much as digits as its factorization.

65506121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 65506121 is about 8093.5851759279. The cubic root of 65506121 is about 403.1134551989.

Adding to 65506121 its reverse (12160556), we get a palindrome (77666677).

The spelling of 65506121 in words is "sixty-five million, five hundred six thousand, one hundred twenty-one".