811683438109 has 2 divisors, whose sum is σ = 811683438110. Its totient is φ = 811683438108.

The previous prime is 811683438101. The next prime is 811683438119. The reversal of 811683438109 is 901834386118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 476880019225 + 334803418884 = 690565^2 + 578622^2 .

It is a cyclic number.

It is not a de Polignac number, because 811683438109 - 2³ = 811683438101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811683438101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405841719054 + 405841719055.

It is an arithmetic number, because the mean of its divisors is an integer number (405841719055).

Almost surely, 2^811683438109 is an apocalyptic number.

It is an amenable number.

811683438109 is a deficient number, since it is larger than the sum of its proper divisors (1).

811683438109 is an equidigital number, since it uses as much as digits as its factorization.

811683438109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 811683438109 in words is "eight hundred eleven billion, six hundred eighty-three million, four hundred thirty-eight thousand, one hundred nine".