81107837 has 2 divisors, whose sum is σ = 81107838. Its totient is φ = 81107836.

The previous prime is 81107801. The next prime is 81107843. The reversal of 81107837 is 73870118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47803396 + 33304441 = 6914^2 + 5771^2 .

It is a cyclic number.

It is not a de Polignac number, because 81107837 - 2⁸ = 81107581 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81107797 and 81107806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81107237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40553918 + 40553919.

It is an arithmetic number, because the mean of its divisors is an integer number (40553919).

Almost surely, 2^81107837 is an apocalyptic number.

It is an amenable number.

81107837 is a deficient number, since it is larger than the sum of its proper divisors (1).

81107837 is an equidigital number, since it uses as much as digits as its factorization.

81107837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 81107837 is about 9005.9889518031. The cubic root of 81107837 is about 432.8667956586.

The spelling of 81107837 in words is "eighty-one million, one hundred seven thousand, eight hundred thirty-seven".