82121208611489 has 2 divisors, whose sum is σ = 82121208611490. Its totient is φ = 82121208611488.

The previous prime is 82121208611441. The next prime is 82121208611527. The reversal of 82121208611489 is 98411680212128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51541027507264 + 30580181104225 = 7179208^2 + 5529935^2 .

It is a cyclic number.

It is not a de Polignac number, because 82121208611489 - 2²⁰ = 82121207562913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82121208611489.

It is not a weakly prime, because it can be changed into another prime (82121208610489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41060604305744 + 41060604305745.

It is an arithmetic number, because the mean of its divisors is an integer number (41060604305745).

Almost surely, 2^{82121208611489} is an apocalyptic number.

It is an amenable number.

82121208611489 is a deficient number, since it is larger than the sum of its proper divisors (1).

82121208611489 is an equidigital number, since it uses as much as digits as its factorization.

82121208611489 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 53.

The spelling of 82121208611489 in words is "eighty-two trillion, one hundred twenty-one billion, two hundred eight million, six hundred eleven thousand, four hundred eighty-nine".