2006037581 has 4 divisors (see below), whose sum is σ = 2006172000. Its totient is φ = 2005903164.

The previous prime is 2006037493. The next prime is 2006037611. The reversal of 2006037581 is 1857306002.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1857306002 = 2 ⋅928653001.

It is a cyclic number.

It is not a de Polignac number, because 2006037581 - 2¹⁸ = 2005775437 is a prime.

It is a super-2 number, since 2×2006037581² = 8048373552768663122, 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 (2006033581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41561 + ... + 75758.

It is an arithmetic number, because the mean of its divisors is an integer number (501543000).

Almost surely, 2^2006037581 is an apocalyptic number.

It is an amenable number.

2006037581 is a deficient number, since it is larger than the sum of its proper divisors (134419).

2006037581 is a wasteful number, since it uses less digits than its factorization.

2006037581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134418.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 2006037581 is about 44788.8108906678. The cubic root of 2006037581 is about 1261.1875888420.

The spelling of 2006037581 in words is "two billion, six million, thirty-seven thousand, five hundred eighty-one".