65289509 has 2 divisors, whose sum is σ = 65289510. Its totient is φ = 65289508.

The previous prime is 65289493. The next prime is 65289517. The reversal of 65289509 is 90598256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59752900 + 5536609 = 7730^2 + 2353^2 .

It is a cyclic number.

It is not a de Polignac number, because 65289509 - 2⁴ = 65289493 is a prime.

It is a super-2 number, since 2×65289509² = 8525439970922162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 65289509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65289559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32644754 + 32644755.

It is an arithmetic number, because the mean of its divisors is an integer number (32644755).

Almost surely, 2^65289509 is an apocalyptic number.

It is an amenable number.

65289509 is a deficient number, since it is larger than the sum of its proper divisors (1).

65289509 is an equidigital number, since it uses as much as digits as its factorization.

65289509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 65289509 is about 8080.1923863235. The cubic root of 65289509 is about 402.6686334781.

The spelling of 65289509 in words is "sixty-five million, two hundred eighty-nine thousand, five hundred nine".