65872109 has 2 divisors, whose sum is σ = 65872110. Its totient is φ = 65872108.

The previous prime is 65872091. The next prime is 65872141. The reversal of 65872109 is 90127856.

Together with previous prime (65872091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 4202500 = 7853^2 + 2050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65872109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

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

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65871109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32936054 + 32936055.

It is an arithmetic number, because the mean of its divisors is an integer number (32936055).

Almost surely, 2^65872109 is an apocalyptic number.

It is an amenable number.

65872109 is a deficient number, since it is larger than the sum of its proper divisors (1).

65872109 is an equidigital number, since it uses as much as digits as its factorization.

65872109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 65872109 is about 8116.1634409369. The cubic root of 65872109 is about 403.8628038701.

The spelling of 65872109 in words is "sixty-five million, eight hundred seventy-two thousand, one hundred nine".