65481289 has 2 divisors, whose sum is σ = 65481290. Its totient is φ = 65481288.

The previous prime is 65481281. The next prime is 65481307. The reversal of 65481289 is 98218456.

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., 35010889 + 30470400 = 5917^2 + 5520^2 .

It is a cyclic number.

It is not a de Polignac number, because 65481289 - 2³ = 65481281 is a prime.

It is not a weakly prime, because it can be changed into another prime (65481281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32740644 + 32740645.

It is an arithmetic number, because the mean of its divisors is an integer number (32740645).

Almost surely, 2^65481289 is an apocalyptic number.

It is an amenable number.

65481289 is a deficient number, since it is larger than the sum of its proper divisors (1).

65481289 is an equidigital number, since it uses as much as digits as its factorization.

65481289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 43.

The square root of 65481289 is about 8092.0509761123. The cubic root of 65481289 is about 403.0625114687.

The spelling of 65481289 in words is "sixty-five million, four hundred eighty-one thousand, two hundred eighty-nine".