81755103 has 4 divisors (see below), whose sum is σ = 109006808. Its totient is φ = 54503400.

The previous prime is 81755099. The next prime is 81755111. The reversal of 81755103 is 30155718.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81755103 - 2² = 81755099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81755173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13625848 + ... + 13625853.

It is an arithmetic number, because the mean of its divisors is an integer number (27251702).

Almost surely, 2^81755103 is an apocalyptic number.

81755103 is a deficient number, since it is larger than the sum of its proper divisors (27251705).

81755103 is a wasteful number, since it uses less digits than its factorization.

81755103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27251704.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 81755103 is about 9041.8528521537. The cubic root of 81755103 is about 434.0152171040.

The spelling of 81755103 in words is "eighty-one million, seven hundred fifty-five thousand, one hundred three".