82118389 has 2 divisors, whose sum is σ = 82118390. Its totient is φ = 82118388.

The previous prime is 82118371. The next prime is 82118417. The reversal of 82118389 is 98381128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48860100 + 33258289 = 6990^2 + 5767^2 .

It is a cyclic number.

It is not a de Polignac number, because 82118389 - 2¹⁵ = 82085621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82118329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41059194 + 41059195.

It is an arithmetic number, because the mean of its divisors is an integer number (41059195).

Almost surely, 2^82118389 is an apocalyptic number.

It is an amenable number.

82118389 is a deficient number, since it is larger than the sum of its proper divisors (1).

82118389 is an equidigital number, since it uses as much as digits as its factorization.

82118389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 40.

The square root of 82118389 is about 9061.9197193531. The cubic root of 82118389 is about 434.6571288566.

The spelling of 82118389 in words is "eighty-two million, one hundred eighteen thousand, three hundred eighty-nine".