82641121 has 2 divisors, whose sum is σ = 82641122. Its totient is φ = 82641120.

The previous prime is 82641113. The next prime is 82641149. The reversal of 82641121 is 12114628.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71216721 + 11424400 = 8439^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 82641121 - 2³ = 82641113 is a prime.

It is not a weakly prime, because it can be changed into another prime (82641421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41320560 + 41320561.

It is an arithmetic number, because the mean of its divisors is an integer number (41320561).

Almost surely, 2^82641121 is an apocalyptic number.

It is an amenable number.

82641121 is a deficient number, since it is larger than the sum of its proper divisors (1).

82641121 is an equidigital number, since it uses as much as digits as its factorization.

82641121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 25.

The square root of 82641121 is about 9090.7161984081. The cubic root of 82641121 is about 435.5774618212.

Adding to 82641121 its reverse (12114628), we get a palindrome (94755749).

The spelling of 82641121 in words is "eighty-two million, six hundred forty-one thousand, one hundred twenty-one".