82581215149 has 2 divisors, whose sum is σ = 82581215150. Its totient is φ = 82581215148.

The previous prime is 82581215147. The next prime is 82581215159. The reversal of 82581215149 is 94151218528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78798104100 + 3783111049 = 280710^2 + 61507^2 .

It is a cyclic number.

It is not a de Polignac number, because 82581215149 - 2¹ = 82581215147 is a prime.

Together with 82581215147, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 82581215099 and 82581215108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82581215141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41290607574 + 41290607575.

It is an arithmetic number, because the mean of its divisors is an integer number (41290607575).

Almost surely, 2^82581215149 is an apocalyptic number.

It is an amenable number.

82581215149 is a deficient number, since it is larger than the sum of its proper divisors (1).

82581215149 is an equidigital number, since it uses as much as digits as its factorization.

82581215149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 46.

The spelling of 82581215149 in words is "eighty-two billion, five hundred eighty-one million, two hundred fifteen thousand, one hundred forty-nine".