81294111 has 10 divisors (see below), whose sum is σ = 121439472. Its totient is φ = 54196020.

The previous prime is 81294079. The next prime is 81294127. The reversal of 81294111 is 11149218.

It is not a de Polignac number, because 81294111 - 2⁵ = 81294079 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81294211) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 501735 + ... + 501896.

Almost surely, 2^81294111 is an apocalyptic number.

81294111 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

81294111 is a deficient number, since it is larger than the sum of its proper divisors (40145361).

81294111 is a wasteful number, since it uses less digits than its factorization.

81294111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003643 (or 1003634 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 81294111 is about 9016.3246946857. The cubic root of 81294111 is about 433.1979193583.

The spelling of 81294111 in words is "eighty-one million, two hundred ninety-four thousand, one hundred eleven".