2001280521 has 8 divisors (see below), whose sum is σ = 2671125984. Its totient is φ = 1332811040.

The previous prime is 2001280493. The next prime is 2001280543. The reversal of 2001280521 is 1250821002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001280521 - 2¹¹ = 2001278473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001280921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340596 + ... + 346421.

It is an arithmetic number, because the mean of its divisors is an integer number (333890748).

Almost surely, 2^2001280521 is an apocalyptic number.

It is an amenable number.

2001280521 is a deficient number, since it is larger than the sum of its proper divisors (669845463).

2001280521 is an equidigital number, since it uses as much as digits as its factorization.

2001280521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687991.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 2001280521 is about 44735.6739191442. The cubic root of 2001280521 is about 1260.1898850886.

The spelling of 2001280521 in words is "two billion, one million, two hundred eighty thousand, five hundred twenty-one".