81104931 has 6 divisors (see below), whose sum is σ = 117151580. Its totient is φ = 54069948.

The previous prime is 81104917. The next prime is 81104941. The reversal of 81104931 is 13940118.

It is not a de Polignac number, because 81104931 - 2¹¹ = 81102883 is a prime.

It is a super-2 number, since 2×81104931² = 13156019665029522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81104895 and 81104904.

It is not an unprimeable number, because it can be changed into a prime (81104911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4505821 + ... + 4505838.

Almost surely, 2^81104931 is an apocalyptic number.

81104931 is a deficient number, since it is larger than the sum of its proper divisors (36046649).

81104931 is a wasteful number, since it uses less digits than its factorization.

81104931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9011665 (or 9011662 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 81104931 is about 9005.8276132735. The cubic root of 81104931 is about 432.8616258913.

It can be divided in two parts, 8110 and 4931, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 81104931 in words is "eighty-one million, one hundred four thousand, nine hundred thirty-one".