82641997 has 2 divisors, whose sum is σ = 82641998. Its totient is φ = 82641996.

The previous prime is 82641991. The next prime is 82642009. The reversal of 82641997 is 79914628.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61168041 + 21473956 = 7821^2 + 4634^2 .

It is a cyclic number.

It is not a de Polignac number, because 82641997 - 2⁷ = 82641869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82641991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41320998 + 41320999.

It is an arithmetic number, because the mean of its divisors is an integer number (41320999).

Almost surely, 2^82641997 is an apocalyptic number.

It is an amenable number.

82641997 is a deficient number, since it is larger than the sum of its proper divisors (1).

82641997 is an equidigital number, since it uses as much as digits as its factorization.

82641997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 82641997 is about 9090.7643793028. The cubic root of 82641997 is about 435.5790008633.

It can be divided in two parts, 82641 and 997, that added together give a palindrome (83638).

The spelling of 82641997 in words is "eighty-two million, six hundred forty-one thousand, nine hundred ninety-seven".