81266103 has 24 divisors (see below), whose sum is σ = 126056736. Its totient is φ = 50265600.

The previous prime is 81266099. The next prime is 81266111. The reversal of 81266103 is 30166218.

It is not a de Polignac number, because 81266103 - 2² = 81266099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81266123) 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 23 ways as a sum of consecutive naturals, for example, 7123 + ... + 14603.

It is an arithmetic number, because the mean of its divisors is an integer number (5252364).

Almost surely, 2^81266103 is an apocalyptic number.

81266103 is a deficient number, since it is larger than the sum of its proper divisors (44790633).

81266103 is a wasteful number, since it uses less digits than its factorization.

81266103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7575 (or 7572 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 81266103 is about 9014.7713781327. The cubic root of 81266103 is about 433.1481642128.

The spelling of 81266103 in words is "eighty-one million, two hundred sixty-six thousand, one hundred three".