2001265187 has 4 divisors (see below), whose sum is σ = 2003996160. Its totient is φ = 1998534216.

The previous prime is 2001265183. The next prime is 2001265223. The reversal of 2001265187 is 7815621002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001265187 - 2² = 2001265183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001265183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1364387 + ... + 1365852.

It is an arithmetic number, because the mean of its divisors is an integer number (500999040).

Almost surely, 2^2001265187 is an apocalyptic number.

2001265187 is a deficient number, since it is larger than the sum of its proper divisors (2730973).

2001265187 is an equidigital number, since it uses as much as digits as its factorization.

2001265187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730972.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 2001265187 is about 44735.5025343407. The cubic root of 2001265187 is about 1260.1866665159.

Adding to 2001265187 its reverse (7815621002), we get a palindrome (9816886189).

The spelling of 2001265187 in words is "two billion, one million, two hundred sixty-five thousand, one hundred eighty-seven".