2001105531 has 24 divisors (see below), whose sum is σ = 2992435680. Its totient is φ = 1287086976.

The previous prime is 2001105529. The next prime is 2001105539. The reversal of 2001105531 is 1355011002.

2001105531 is a `hidden beast` number, since 2 + 0 + 0 + 110 + 553 + 1 = 666.

It is not a de Polignac number, because 2001105531 - 2¹ = 2001105529 is a prime.

It is a super-2 number, since 2×2001105531² = 8008846692397583922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001105539) 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, 518250 + ... + 522096.

It is an arithmetic number, because the mean of its divisors is an integer number (124684820).

Almost surely, 2^2001105531 is an apocalyptic number.

2001105531 is a deficient number, since it is larger than the sum of its proper divisors (991330149).

2001105531 is a wasteful number, since it uses less digits than its factorization.

2001105531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5875 (or 5872 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 2001105531 is about 44733.7180547291. The cubic root of 2001105531 is about 1260.1531540968.

Adding to 2001105531 its reverse (1355011002), we get a palindrome (3356116533).

The spelling of 2001105531 in words is "two billion, one million, one hundred five thousand, five hundred thirty-one".