81104465 has 8 divisors (see below), whose sum is σ = 104812008. Its totient is φ = 59892480.

The previous prime is 81104449. The next prime is 81104477. The reversal of 81104465 is 56440118.

It can be written as a sum of positive squares in 4 ways, for example, as 984064 + 80120401 = 992^2 + 8951^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81104465 - 2⁴ = 81104449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 623816 + ... + 623945.

It is an arithmetic number, because the mean of its divisors is an integer number (13101501).

Almost surely, 2^81104465 is an apocalyptic number.

It is an amenable number.

81104465 is a deficient number, since it is larger than the sum of its proper divisors (23707543).

81104465 is a wasteful number, since it uses less digits than its factorization.

81104465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247779.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 81104465 is about 9005.8017411000. The cubic root of 81104465 is about 432.8607968669.

The spelling of 81104465 in words is "eighty-one million, one hundred four thousand, four hundred sixty-five".