65836121 has 16 divisors (see below), whose sum is σ = 79027200. Its totient is φ = 54183168.

The previous prime is 65836117. The next prime is 65836163. The reversal of 65836121 is 12163856.

It is a happy number.

It is not a de Polignac number, because 65836121 - 2² = 65836117 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65836171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3641 + ... + 12038.

It is an arithmetic number, because the mean of its divisors is an integer number (4939200).

Almost surely, 2^65836121 is an apocalyptic number.

It is an amenable number.

65836121 is a deficient number, since it is larger than the sum of its proper divisors (13191079).

65836121 is a wasteful number, since it uses less digits than its factorization.

65836121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15728.

The product of its digits is 8640, while the sum is 32.

The square root of 65836121 is about 8113.9460806688. The cubic root of 65836121 is about 403.7892428317.

Adding to 65836121 its reverse (12163856), we get a palindrome (77999977).

The spelling of 65836121 in words is "sixty-five million, eight hundred thirty-six thousand, one hundred twenty-one".