81108337 has 4 divisors (see below), whose sum is σ = 81132660. Its totient is φ = 81084016.

The previous prime is 81108289. The next prime is 81108361. The reversal of 81108337 is 73380118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62583921 + 18524416 = 7911^2 + 4304^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81108337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81108299 and 81108308.

It is not an unprimeable number, because it can be changed into a prime (81108437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6178 + ... + 14155.

It is an arithmetic number, because the mean of its divisors is an integer number (20283165).

Almost surely, 2^81108337 is an apocalyptic number.

It is an amenable number.

81108337 is a deficient number, since it is larger than the sum of its proper divisors (24323).

81108337 is a wasteful number, since it uses less digits than its factorization.

81108337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24322.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 81108337 is about 9006.0167110660. The cubic root of 81108337 is about 432.8676851450.

The spelling of 81108337 in words is "eighty-one million, one hundred eight thousand, three hundred thirty-seven".