2001335549 has 4 divisors (see below), whose sum is σ = 2001478080. Its totient is φ = 2001193020.

The previous prime is 2001335537. The next prime is 2001335563. The reversal of 2001335549 is 9455331002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001335549 - 2²⁰ = 2000286973 is a prime.

It is a super-2 number, since 2×2001335549² = 8010687959382262802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001335579) 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, 47579 + ... + 79160.

It is an arithmetic number, because the mean of its divisors is an integer number (500369520).

Almost surely, 2^2001335549 is an apocalyptic number.

It is an amenable number.

2001335549 is a deficient number, since it is larger than the sum of its proper divisors (142531).

2001335549 is a wasteful number, since it uses less digits than its factorization.

2001335549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142530.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 2001335549 is about 44736.2889498000. The cubic root of 2001335549 is about 1260.2014352091.

The spelling of 2001335549 in words is "two billion, one million, three hundred thirty-five thousand, five hundred forty-nine".