82861393309 has 2 divisors, whose sum is σ = 82861393310. Its totient is φ = 82861393308.

The previous prime is 82861393283. The next prime is 82861393331. The reversal of 82861393309 is 90339316828.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82558528900 + 302864409 = 287330^2 + 17403^2 .

It is a cyclic number.

It is not a de Polignac number, because 82861393309 - 2²⁷ = 82727175581 is a prime.

It is a super-2 number, since 2×82861393309² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82861393379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41430696654 + 41430696655.

It is an arithmetic number, because the mean of its divisors is an integer number (41430696655).

Almost surely, 2^82861393309 is an apocalyptic number.

It is an amenable number.

82861393309 is a deficient number, since it is larger than the sum of its proper divisors (1).

82861393309 is an equidigital number, since it uses as much as digits as its factorization.

82861393309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 82861393309 in words is "eighty-two billion, eight hundred sixty-one million, three hundred ninety-three thousand, three hundred nine".