81116379 has 24 divisors (see below), whose sum is σ = 119351232. Its totient is φ = 53080560.

The previous prime is 81116353. The next prime is 81116381. The reversal of 81116379 is 97361118.

81116379 is a `hidden beast` number, since 8 + 1 + 11 + 637 + 9 = 666.

It is not a de Polignac number, because 81116379 - 2⁷ = 81116251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81116309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125832 + ... + 126474.

It is an arithmetic number, because the mean of its divisors is an integer number (4972968).

Almost surely, 2^81116379 is an apocalyptic number.

81116379 is a deficient number, since it is larger than the sum of its proper divisors (38234853).

81116379 is a wasteful number, since it uses less digits than its factorization.

81116379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887 (or 884 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 81116379 is about 9006.4631792952. The cubic root of 81116379 is about 432.8819911420.

The spelling of 81116379 in words is "eighty-one million, one hundred sixteen thousand, three hundred seventy-nine".