65415121 has 2 divisors, whose sum is σ = 65415122. Its totient is φ = 65415120.

The previous prime is 65415109. The next prime is 65415173. The reversal of 65415121 is 12151456.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56415121 + 9000000 = 7511^2 + 3000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65415121 is a prime.

It is not a weakly prime, because it can be changed into another prime (65415101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32707560 + 32707561.

It is an arithmetic number, because the mean of its divisors is an integer number (32707561).

Almost surely, 2^65415121 is an apocalyptic number.

It is an amenable number.

65415121 is a deficient number, since it is larger than the sum of its proper divisors (1).

65415121 is an equidigital number, since it uses as much as digits as its factorization.

65415121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 65415121 is about 8087.9614860606. The cubic root of 65415121 is about 402.9267025535.

Adding to 65415121 its reverse (12151456), we get a palindrome (77566577).

It can be divided in two parts, 65415 and 121, that added together give a 16-th power (65536 = 2¹⁶).

The spelling of 65415121 in words is "sixty-five million, four hundred fifteen thousand, one hundred twenty-one".