2001280545 has 96 divisors (see below), whose sum is σ = 4218065280. Its totient is φ = 865105920.

The previous prime is 2001280543. The next prime is 2001280607. The reversal of 2001280545 is 5450821002.

It is a happy number.

It is not a de Polignac number, because 2001280545 - 2¹ = 2001280543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001280543) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 153627 + ... + 166143.

It is an arithmetic number, because the mean of its divisors is an integer number (43938180).

Almost surely, 2^2001280545 is an apocalyptic number.

It is an amenable number.

2001280545 is an abundant number, since it is smaller than the sum of its proper divisors (2216784735).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001280545 is a wasteful number, since it uses less digits than its factorization.

2001280545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12575 (or 12572 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 2001280545 is about 44735.6741873865. The cubic root of 2001280545 is about 1260.1898901262.

The spelling of 2001280545 in words is "two billion, one million, two hundred eighty thousand, five hundred forty-five".