65013121 has 2 divisors, whose sum is σ = 65013122. Its totient is φ = 65013120.

The previous prime is 65013097. The next prime is 65013133. The reversal of 65013121 is 12131056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60450625 + 4562496 = 7775^2 + 2136^2 .

It is a cyclic number.

It is not a de Polignac number, because 65013121 - 2¹¹ = 65011073 is a prime.

It is not a weakly prime, because it can be changed into another prime (65013821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32506560 + 32506561.

It is an arithmetic number, because the mean of its divisors is an integer number (32506561).

Almost surely, 2^65013121 is an apocalyptic number.

It is an amenable number.

65013121 is a deficient number, since it is larger than the sum of its proper divisors (1).

65013121 is an equidigital number, since it uses as much as digits as its factorization.

65013121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 65013121 is about 8063.0714371138. The cubic root of 65013121 is about 402.0996283683.

Adding to 65013121 its reverse (12131056), we get a palindrome (77144177).

The spelling of 65013121 in words is "sixty-five million, thirteen thousand, one hundred twenty-one".