82441981 has 2 divisors, whose sum is σ = 82441982. Its totient is φ = 82441980.

The previous prime is 82441973. The next prime is 82441987. The reversal of 82441981 is 18914428.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78481881 + 3960100 = 8859^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 82441981 - 2³ = 82441973 is a prime.

It is a super-2 number, since 2×82441981² = 13593360462408722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82441981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82441987) 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, 41220990 + 41220991.

It is an arithmetic number, because the mean of its divisors is an integer number (41220991).

Almost surely, 2^82441981 is an apocalyptic number.

It is an amenable number.

82441981 is a deficient number, since it is larger than the sum of its proper divisors (1).

82441981 is an equidigital number, since it uses as much as digits as its factorization.

82441981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 82441981 is about 9079.7566597349. The cubic root of 82441981 is about 435.2273106245.

The spelling of 82441981 in words is "eighty-two million, four hundred forty-one thousand, nine hundred eighty-one".