81110873 has 2 divisors, whose sum is σ = 81110874. Its totient is φ = 81110872.

The previous prime is 81110851. The next prime is 81110891. The reversal of 81110873 is 37801118.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54567769 + 26543104 = 7387^2 + 5152^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81110873 is a prime.

It is a super-3 number, since 3×81110873³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (81113873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40555436 + 40555437.

It is an arithmetic number, because the mean of its divisors is an integer number (40555437).

Almost surely, 2^81110873 is an apocalyptic number.

It is an amenable number.

81110873 is a deficient number, since it is larger than the sum of its proper divisors (1).

81110873 is an equidigital number, since it uses as much as digits as its factorization.

81110873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 81110873 is about 9006.1575047298. The cubic root of 81110873 is about 432.8721965637.

The spelling of 81110873 in words is "eighty-one million, one hundred ten thousand, eight hundred seventy-three".