81107361 has 12 divisors (see below), whose sum is σ = 122249088. Its totient is φ = 51720504.

The previous prime is 81107339. The next prime is 81107393. The reversal of 81107361 is 16370118.

It is not a de Polignac number, because 81107361 - 2⁶ = 81107297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81107321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195705 + ... + 196118.

It is an arithmetic number, because the mean of its divisors is an integer number (10187424).

Almost surely, 2^81107361 is an apocalyptic number.

It is an amenable number.

81107361 is a deficient number, since it is larger than the sum of its proper divisors (41141727).

81107361 is a wasteful number, since it uses less digits than its factorization.

81107361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391852 (or 391849 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 81107361 is about 9005.9625249054. The cubic root of 81107361 is about 432.8659488641.

Adding to 81107361 its reverse (16370118), we get a palindrome (97477479).

The spelling of 81107361 in words is "eighty-one million, one hundred seven thousand, three hundred sixty-one".