2001389553 has 24 divisors (see below), whose sum is σ = 3000055968. Its totient is φ = 1333329984.

The previous prime is 2001389521. The next prime is 2001389591. The reversal of 2001389553 is 3559831002.

2001389553 is a `hidden beast` number, since 20 + 0 + 1 + 3 + 89 + 553 = 666.

It is not a de Polignac number, because 2001389553 - 2⁵ = 2001389521 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2001389153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 689401 + ... + 692297.

It is an arithmetic number, because the mean of its divisors is an integer number (125002332).

Almost surely, 2^2001389553 is an apocalyptic number.

It is an amenable number.

2001389553 is a deficient number, since it is larger than the sum of its proper divisors (998666415).

2001389553 is an equidigital number, since it uses as much as digits as its factorization.

2001389553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5755 (or 5743 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 2001389553 is about 44736.8925273090. The cubic root of 2001389553 is about 1260.2127701909.

The spelling of 2001389553 in words is "two billion, one million, three hundred eighty-nine thousand, five hundred fifty-three".