82388561 has 2 divisors, whose sum is σ = 82388562. Its totient is φ = 82388560.

The previous prime is 82388549. The next prime is 82388563. The reversal of 82388561 is 16588328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74995600 + 7392961 = 8660^2 + 2719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82388561 is a prime.

Together with 82388563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (82388563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41194280 + 41194281.

It is an arithmetic number, because the mean of its divisors is an integer number (41194281).

Almost surely, 2^82388561 is an apocalyptic number.

It is an amenable number.

82388561 is a deficient number, since it is larger than the sum of its proper divisors (1).

82388561 is an equidigital number, since it uses as much as digits as its factorization.

82388561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 41.

The square root of 82388561 is about 9076.8144742525. The cubic root of 82388561 is about 435.1332854438.

The spelling of 82388561 in words is "eighty-two million, three hundred eighty-eight thousand, five hundred sixty-one".