82481989 has 2 divisors, whose sum is σ = 82481990. Its totient is φ = 82481988.

The previous prime is 82481981. The next prime is 82481999. The reversal of 82481989 is 98918428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76562500 + 5919489 = 8750^2 + 2433^2 .

It is a cyclic number.

It is not a de Polignac number, because 82481989 - 2³ = 82481981 is a prime.

It is a super-2 number, since 2×82481989² = 13606557018792242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82481981) 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, 41240994 + 41240995.

It is an arithmetic number, because the mean of its divisors is an integer number (41240995).

Almost surely, 2^82481989 is an apocalyptic number.

It is an amenable number.

82481989 is a deficient number, since it is larger than the sum of its proper divisors (1).

82481989 is an equidigital number, since it uses as much as digits as its factorization.

82481989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 49.

The square root of 82481989 is about 9081.9595352545. The cubic root of 82481989 is about 435.2977025862.

The spelling of 82481989 in words is "eighty-two million, four hundred eighty-one thousand, nine hundred eighty-nine".