2001535 has 4 divisors (see below), whose sum is σ = 2401848. Its totient is φ = 1601224.

The previous prime is 2001533. The next prime is 2001539. The reversal of 2001535 is 5351002.

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 2001535 - 2¹ = 2001533 is a prime.

It is a super-2 number, since 2×2001535² = 8012284712450, which contains 22 as substring.

It is a Duffinian number.

2001535 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001533) 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, 200149 + ... + 200158.

It is an arithmetic number, because the mean of its divisors is an integer number (600462).

2^2001535 is an apocalyptic number.

2001535 is a deficient number, since it is larger than the sum of its proper divisors (400313).

2001535 is an equidigital number, since it uses as much as digits as its factorization.

2001535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400312.

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 2001535 is about 1414.7561627362. The cubic root of 2001535 is about 126.0243297269.

Adding to 2001535 its reverse (5351002), we get a palindrome (7352537).

The spelling of 2001535 in words is "two million, one thousand, five hundred thirty-five".