2001165 has 16 divisors (see below), whose sum is σ = 3240000. Its totient is φ = 1054592.

The previous prime is 2001163. The next prime is 2001179. The reversal of 2001165 is 5611002.

2001165 = T₁₆₆ + T₁₆₇ + ... + T₂₅₄.

It is a cyclic number.

It is not a de Polignac number, because 2001165 - 2¹ = 2001163 is a prime.

It is a super-2 number, since 2×2001165² = 8009322714450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001163) 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, 586 + ... + 2084.

It is an arithmetic number, because the mean of its divisors is an integer number (202500).

2^2001165 is an apocalyptic number.

It is an amenable number.

2001165 is a deficient number, since it is larger than the sum of its proper divisors (1238835).

2001165 is a wasteful number, since it uses less digits than its factorization.

2001165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 2001165 is about 1414.6253921092. The cubic root of 2001165 is about 126.0165637081.

Adding to 2001165 its reverse (5611002), we get a palindrome (7612167).

The spelling of 2001165 in words is "two million, one thousand, one hundred sixty-five".