2002678981 has 2 divisors, whose sum is σ = 2002678982. Its totient is φ = 2002678980.

The previous prime is 2002678973. The next prime is 2002679011. The reversal of 2002678981 is 1898762002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1981140100 + 21538881 = 44510^2 + 4641^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002678981 - 2³ = 2002678973 is a prime.

It is a super-2 number, since 2×2002678981² = 8021446201878396722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2002678921) 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 as a sum of consecutive naturals, namely, 1001339490 + 1001339491.

It is an arithmetic number, because the mean of its divisors is an integer number (1001339491).

Almost surely, 2^2002678981 is an apocalyptic number.

It is an amenable number.

2002678981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002678981 is an equidigital number, since it uses as much as digits as its factorization.

2002678981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 2002678981 is about 44751.3014447625. The cubic root of 2002678981 is about 1260.4833496635.

The spelling of 2002678981 in words is "two billion, two million, six hundred seventy-eight thousand, nine hundred eighty-one".