2006233681 has 9 divisors (see below), whose sum is σ = 2051980891. Its totient is φ = 1961487472.

The previous prime is 2006233667. The next prime is 2006233687. The reversal of 2006233681 is 1863326002.

The square root of 2006233681 is 44791.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 835499025 + 1170734656 = 28905^2 + 34216^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2006233681 is a prime.

It is a super-2 number, since 2×2006233681² = 8049947165557619522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006233687) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2104701 + ... + 2105653.

Almost surely, 2^2006233681 is an apocalyptic number.

2006233681 is the 44791-st square number.

2006233681 is the 22396-th centered octagonal number.

It is an amenable number.

2006233681 is a deficient number, since it is larger than the sum of its proper divisors (45747210).

2006233681 is an frugal number, since it uses more digits than its factorization.

2006233681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The cubic root of 2006233681 is about 1261.2286832579.

Adding to 2006233681 its reverse (1863326002), we get a palindrome (3869559683).

It can be divided in two parts, 200623 and 3681, that added together give a square (204304 = 452²).

The spelling of 2006233681 in words is "two billion, six million, two hundred thirty-three thousand, six hundred eighty-one".