82243813 has 2 divisors, whose sum is σ = 82243814. Its totient is φ = 82243812.

The previous prime is 82243801. The next prime is 82243853. The reversal of 82243813 is 31834228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55026724 + 27217089 = 7418^2 + 5217^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82243813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82243853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41121906 + 41121907.

It is an arithmetic number, because the mean of its divisors is an integer number (41121907).

Almost surely, 2^82243813 is an apocalyptic number.

It is an amenable number.

82243813 is a deficient number, since it is larger than the sum of its proper divisors (1).

82243813 is an equidigital number, since it uses as much as digits as its factorization.

82243813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 82243813 is about 9068.8374668422. The cubic root of 82243813 is about 434.8783083212.

The spelling of 82243813 in words is "eighty-two million, two hundred forty-three thousand, eight hundred thirteen".