81103705 has 8 divisors (see below), whose sum is σ = 97372800. Its totient is φ = 64850736.

The previous prime is 81103619. The next prime is 81103721. The reversal of 81103705 is 50730118.

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

It is a cyclic number.

It is not a de Polignac number, because 81103705 - 2⁷ = 81103577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81103705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17526 + ... + 21664.

It is an arithmetic number, because the mean of its divisors is an integer number (12171600).

Almost surely, 2^81103705 is an apocalyptic number.

It is an amenable number.

81103705 is a deficient number, since it is larger than the sum of its proper divisors (16269095).

81103705 is a wasteful number, since it uses less digits than its factorization.

81103705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8063.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 81103705 is about 9005.7595459795. The cubic root of 81103705 is about 432.8594448031.

The spelling of 81103705 in words is "eighty-one million, one hundred three thousand, seven hundred five".