81188379 has 32 divisors (see below), whose sum is σ = 129024000. Its totient is φ = 50274432.

The previous prime is 81188351. The next prime is 81188383. The reversal of 81188379 is 97388118.

It is not a de Polignac number, because 81188379 - 2⁸ = 81188123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81188329) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35142 + ... + 37380.

It is an arithmetic number, because the mean of its divisors is an integer number (4032000).

Almost surely, 2^81188379 is an apocalyptic number.

81188379 is a deficient number, since it is larger than the sum of its proper divisors (47835621).

81188379 is a wasteful number, since it uses less digits than its factorization.

81188379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2344 (or 2338 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 81188379 is about 9010.4594222492. The cubic root of 81188379 is about 433.0100305783.

The spelling of 81188379 in words is "eighty-one million, one hundred eighty-eight thousand, three hundred seventy-nine".