2002199981 has 16 divisors (see below), whose sum is σ = 2108156400. Its totient is φ = 1899583488.

The previous prime is 2002199977. The next prime is 2002199999. The reversal of 2002199981 is 1899912002.

It can be written as a sum of positive squares in 8 ways, for example, as 27730756 + 1974469225 = 5266^2 + 44435^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002199981 - 2² = 2002199977 is a prime.

It is a super-2 number, since 2×2002199981² = 8017609527832800722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002199281) 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 15 ways as a sum of consecutive naturals, for example, 236225 + ... + 244553.

It is an arithmetic number, because the mean of its divisors is an integer number (131759775).

Almost surely, 2^2002199981 is an apocalyptic number.

It is an amenable number.

2002199981 is a deficient number, since it is larger than the sum of its proper divisors (105956419).

2002199981 is an equidigital number, since it uses as much as digits as its factorization.

2002199981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8528.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 2002199981 is about 44745.9493250506. The cubic root of 2002199981 is about 1260.3828476737.

The spelling of 2002199981 in words is "two billion, two million, one hundred ninety-nine thousand, nine hundred eighty-one".