81103713 has 4 divisors (see below), whose sum is σ = 108138288. Its totient is φ = 54069140.

The previous prime is 81103619. The next prime is 81103721. The reversal of 81103713 is 31730118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81103713 - 2¹⁰ = 81102689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81103733) 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 3 ways as a sum of consecutive naturals, for example, 13517283 + ... + 13517288.

It is an arithmetic number, because the mean of its divisors is an integer number (27034572).

Almost surely, 2^81103713 is an apocalyptic number.

It is an amenable number.

81103713 is a deficient number, since it is larger than the sum of its proper divisors (27034575).

81103713 is a wasteful number, since it uses less digits than its factorization.

81103713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27034574.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 81103713 is about 9005.7599901396. The cubic root of 81103713 is about 432.8594590353.

The spelling of 81103713 in words is "eighty-one million, one hundred three thousand, seven hundred thirteen".