820082621489 has 2 divisors, whose sum is σ = 820082621490. Its totient is φ = 820082621488.

The previous prime is 820082621429. The next prime is 820082621563. The reversal of 820082621489 is 984126280028.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 689577446464 + 130505175025 = 830408^2 + 361255^2 .

It is a cyclic number.

It is not a de Polignac number, because 820082621489 - 2²⁸ = 819814186033 is a prime.

It is not a weakly prime, because it can be changed into another prime (820082621429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410041310744 + 410041310745.

It is an arithmetic number, because the mean of its divisors is an integer number (410041310745).

Almost surely, 2^820082621489 is an apocalyptic number.

It is an amenable number.

820082621489 is a deficient number, since it is larger than the sum of its proper divisors (1).

820082621489 is an equidigital number, since it uses as much as digits as its factorization.

820082621489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 884736, while the sum is 50.

The spelling of 820082621489 in words is "eight hundred twenty billion, eighty-two million, six hundred twenty-one thousand, four hundred eighty-nine".