81969103 has 4 divisors (see below), whose sum is σ = 82033600. Its totient is φ = 81904608.

The previous prime is 81969091. The next prime is 81969119. The reversal of 81969103 is 30196918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30196918 = 2 ⋅15098459.

It is a cyclic number.

It is not a de Polignac number, because 81969103 - 2⁹ = 81968591 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 (81969143) 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, 30303 + ... + 32896.

It is an arithmetic number, because the mean of its divisors is an integer number (20508400).

Almost surely, 2^81969103 is an apocalyptic number.

81969103 is a deficient number, since it is larger than the sum of its proper divisors (64497).

81969103 is a wasteful number, since it uses less digits than its factorization.

81969103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64496.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 81969103 is about 9053.6789759744. The cubic root of 81969103 is about 434.3935760943.

The spelling of 81969103 in words is "eighty-one million, nine hundred sixty-nine thousand, one hundred three".