65581289 has 2 divisors, whose sum is σ = 65581290. Its totient is φ = 65581288.

The previous prime is 65581261. The next prime is 65581301. The reversal of 65581289 is 98218556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56370064 + 9211225 = 7508^2 + 3035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65581289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65581589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32790644 + 32790645.

It is an arithmetic number, because the mean of its divisors is an integer number (32790645).

Almost surely, 2^65581289 is an apocalyptic number.

It is an amenable number.

65581289 is a deficient number, since it is larger than the sum of its proper divisors (1).

65581289 is an equidigital number, since it uses as much as digits as its factorization.

65581289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 44.

The square root of 65581289 is about 8098.2275221187. The cubic root of 65581289 is about 403.2675865938.

The spelling of 65581289 in words is "sixty-five million, five hundred eighty-one thousand, two hundred eighty-nine".