2018981 has 2 divisors, whose sum is σ = 2018982. Its totient is φ = 2018980.

The previous prime is 2018957. The next prime is 2018987. The reversal of 2018981 is 1898102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1934881 + 84100 = 1391^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 2018981 - 2¹⁰ = 2017957 is a prime.

It is a super-2 number, since 2×2018981² = 8152568556722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2018987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009490 + 1009491.

It is an arithmetic number, because the mean of its divisors is an integer number (1009491).

2^2018981 is an apocalyptic number.

It is an amenable number.

2018981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2018981 is an equidigital number, since it uses as much as digits as its factorization.

2018981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 2018981 is about 1420.9085121851. The cubic root of 2018981 is about 126.3894267247.

The spelling of 2018981 in words is "two million, eighteen thousand, nine hundred eighty-one".