65538989 has 2 divisors, whose sum is σ = 65538990. Its totient is φ = 65538988.

The previous prime is 65538973. The next prime is 65539021. The reversal of 65538989 is 98983556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41822089 + 23716900 = 6467^2 + 4870^2 .

It is a cyclic number.

It is not a de Polignac number, because 65538989 - 2⁴ = 65538973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65538989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65538919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32769494 + 32769495.

It is an arithmetic number, because the mean of its divisors is an integer number (32769495).

Almost surely, 2^65538989 is an apocalyptic number.

It is an amenable number.

65538989 is a deficient number, since it is larger than the sum of its proper divisors (1).

65538989 is an equidigital number, since it uses as much as digits as its factorization.

65538989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 53.

The square root of 65538989 is about 8095.6154182372. The cubic root of 65538989 is about 403.1808652742.

The spelling of 65538989 in words is "sixty-five million, five hundred thirty-eight thousand, nine hundred eighty-nine".