2001765139 has 16 divisors (see below), whose sum is σ = 2276112384. Its totient is φ = 1743955200.

The previous prime is 2001765091. The next prime is 2001765149. The reversal of 2001765139 is 9315671002.

It is a cyclic number.

It is not a de Polignac number, because 2001765139 - 2¹⁷ = 2001634067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001765149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6627 + ... + 63619.

It is an arithmetic number, because the mean of its divisors is an integer number (142257024).

Almost surely, 2^2001765139 is an apocalyptic number.

2001765139 is a deficient number, since it is larger than the sum of its proper divisors (274347245).

2001765139 is a wasteful number, since it uses less digits than its factorization.

2001765139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57138.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 2001765139 is about 44741.0900515399. The cubic root of 2001765139 is about 1260.2915968688.

The spelling of 2001765139 in words is "two billion, one million, seven hundred sixty-five thousand, one hundred thirty-nine".