65138841 has 12 divisors (see below), whose sum is σ = 94329300. Its totient is φ = 43315200.

The previous prime is 65138837. The next prime is 65138861. The reversal of 65138841 is 14883156.

It can be written as a sum of positive squares in 2 ways, for example, as 61544025 + 3594816 = 7845^2 + 1896^2 .

It is not a de Polignac number, because 65138841 - 2² = 65138837 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65138796 and 65138805.

It is not an unprimeable number, because it can be changed into a prime (65138861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5416 + ... + 12633.

It is an arithmetic number, because the mean of its divisors is an integer number (7860775).

Almost surely, 2^65138841 is an apocalyptic number.

It is an amenable number.

65138841 is a deficient number, since it is larger than the sum of its proper divisors (29190459).

65138841 is a wasteful number, since it uses less digits than its factorization.

65138841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18456 (or 18453 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 65138841 is about 8070.8637084268. The cubic root of 65138841 is about 402.3586500051.

The spelling of 65138841 in words is "sixty-five million, one hundred thirty-eight thousand, eight hundred forty-one".