2001765989 has 2 divisors, whose sum is σ = 2001765990. Its totient is φ = 2001765988.

The previous prime is 2001765973. The next prime is 2001766009. The reversal of 2001765989 is 9895671002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1215916900 + 785849089 = 34870^2 + 28033^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001765989 - 2⁴ = 2001765973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001765949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000882994 + 1000882995.

It is an arithmetic number, because the mean of its divisors is an integer number (1000882995).

Almost surely, 2^2001765989 is an apocalyptic number.

It is an amenable number.

2001765989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001765989 is an equidigital number, since it uses as much as digits as its factorization.

2001765989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 2001765989 is about 44741.0995506369. The cubic root of 2001765989 is about 1260.2917752526.

The spelling of 2001765989 in words is "two billion, one million, seven hundred sixty-five thousand, nine hundred eighty-nine".