2002891081 has 4 divisors (see below), whose sum is σ = 2007648964. Its totient is φ = 1998133200.

The previous prime is 2002891063. The next prime is 2002891087. The reversal of 2002891081 is 1801982002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 859369225 + 1143521856 = 29315^2 + 33816^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002891081 - 2⁹ = 2002890569 is a prime.

It is a super-2 number, since 2×2002891081² = 8023145364698697122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2002891087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2378310 + ... + 2379151.

It is an arithmetic number, because the mean of its divisors is an integer number (501912241).

Almost surely, 2^2002891081 is an apocalyptic number.

It is an amenable number.

2002891081 is a deficient number, since it is larger than the sum of its proper divisors (4757883).

2002891081 is an equidigital number, since it uses as much as digits as its factorization.

2002891081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4757882.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 2002891081 is about 44753.6711455049. The cubic root of 2002891081 is about 1260.5278465738.

The spelling of 2002891081 in words is "two billion, two million, eight hundred ninety-one thousand, eighty-one".