2001599 has 4 divisors (see below), whose sum is σ = 2021136. Its totient is φ = 1982064.

The previous prime is 2001583. The next prime is 2001611. The reversal of 2001599 is 9951002.

It is a happy number.

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 2001599 - 2⁴ = 2001583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001509) 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, 9614 + ... + 9819.

It is an arithmetic number, because the mean of its divisors is an integer number (505284).

2^2001599 is an apocalyptic number.

2001599 is a deficient number, since it is larger than the sum of its proper divisors (19537).

2001599 is a wasteful number, since it uses less digits than its factorization.

2001599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19536.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 2001599 is about 1414.7787812941. The cubic root of 2001599 is about 126.0256729412.

The spelling of 2001599 in words is "two million, one thousand, five hundred ninety-nine".