2001802091 has 16 divisors (see below), whose sum is σ = 2150353920. Its totient is φ = 1860032160.

The previous prime is 2001802069. The next prime is 2001802097. The reversal of 2001802091 is 1902081002.

It is a cyclic number.

It is not a de Polignac number, because 2001802091 - 2⁶ = 2001802027 is a prime.

It is a super-2 number, since 2×2001802091² = 8014423223063944562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001802097) 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 15 ways as a sum of consecutive naturals, for example, 65921 + ... + 91373.

It is an arithmetic number, because the mean of its divisors is an integer number (134397120).

Almost surely, 2^2001802091 is an apocalyptic number.

2001802091 is a deficient number, since it is larger than the sum of its proper divisors (148551829).

2001802091 is a wasteful number, since it uses less digits than its factorization.

2001802091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25586.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2001802091 is about 44741.5030033637. The cubic root of 2001802091 is about 1260.2993516927.

Adding to 2001802091 its reverse (1902081002), we get a palindrome (3903883093).

The spelling of 2001802091 in words is "two billion, one million, eight hundred two thousand, ninety-one".