1982681 has 2 divisors, whose sum is σ = 1982682. Its totient is φ = 1982680.

The previous prime is 1982671. The next prime is 1982713. The reversal of 1982681 is 1862891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1690000 + 292681 = 1300^2 + 541^2 .

It is an emirp because it is prime and its reverse (1862891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1982681 - 2¹⁴ = 1966297 is a prime.

It is a super-2 number, since 2×1982681² = 7862047895522, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1982611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991340 + 991341.

It is an arithmetic number, because the mean of its divisors is an integer number (991341).

2^1982681 is an apocalyptic number.

It is an amenable number.

1982681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982681 is an equidigital number, since it uses as much as digits as its factorization.

1982681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 35.

The square root of 1982681 is about 1408.0770575505. The cubic root of 1982681 is about 125.6273739475.

The spelling of 1982681 in words is "one million, nine hundred eighty-two thousand, six hundred eighty-one".