19882981 has 2 divisors, whose sum is σ = 19882982. Its totient is φ = 19882980.

The previous prime is 19882943. The next prime is 19883027. The reversal of 19882981 is 18928891.

It is an a-pointer prime, because the next prime (19883027) can be obtained adding 19882981 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17430625 + 2452356 = 4175^2 + 1566^2 .

It is an emirp because it is prime and its reverse (18928891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19882981 - 2¹¹ = 19880933 is a prime.

It is a super-2 number, since 2×19882981² = 790665866892722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19882921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9941490 + 9941491.

It is an arithmetic number, because the mean of its divisors is an integer number (9941491).

Almost surely, 2^19882981 is an apocalyptic number.

It is an amenable number.

19882981 is a deficient number, since it is larger than the sum of its proper divisors (1).

19882981 is an equidigital number, since it uses as much as digits as its factorization.

19882981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 46.

The square root of 19882981 is about 4459.0336397027. The cubic root of 19882981 is about 270.9113284058.

The spelling of 19882981 in words is "nineteen million, eight hundred eighty-two thousand, nine hundred eighty-one".