65289989 has 2 divisors, whose sum is σ = 65289990. Its totient is φ = 65289988.

The previous prime is 65289977. The next prime is 65290037. The reversal of 65289989 is 98998256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64673764 + 616225 = 8042^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 65289989 - 2¹² = 65285893 is a prime.

It is a Sophie Germain 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 (65289919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32644994 + 32644995.

It is an arithmetic number, because the mean of its divisors is an integer number (32644995).

Almost surely, 2^65289989 is an apocalyptic number.

It is an amenable number.

65289989 is a deficient number, since it is larger than the sum of its proper divisors (1).

65289989 is an equidigital number, since it uses as much as digits as its factorization.

65289989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 56.

The square root of 65289989 is about 8080.2220885320. Note that the first 3 decimals coincide. The cubic root of 65289989 is about 402.6696202648.

The spelling of 65289989 in words is "sixty-five million, two hundred eighty-nine thousand, nine hundred eighty-nine".