65280989 has 2 divisors, whose sum is σ = 65280990. Its totient is φ = 65280988.

The previous prime is 65280983. The next prime is 65280991. The reversal of 65280989 is 98908256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 8655364 = 7525^2 + 2942^2 .

It is a cyclic number.

It is not a de Polignac number, because 65280989 - 2⁴ = 65280973 is a prime.

It is a Sophie Germain prime.

Together with 65280991, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65280983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32640494 + 32640495.

It is an arithmetic number, because the mean of its divisors is an integer number (32640495).

Almost surely, 2^65280989 is an apocalyptic number.

It is an amenable number.

65280989 is a deficient number, since it is larger than the sum of its proper divisors (1).

65280989 is an equidigital number, since it uses as much as digits as its factorization.

65280989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 65280989 is about 8079.6651539529. The cubic root of 65280989 is about 402.6511172081.

The spelling of 65280989 in words is "sixty-five million, two hundred eighty thousand, nine hundred eighty-nine".