81100379 has 8 divisors (see below), whose sum is σ = 86399040. Its totient is φ = 75904776.

The previous prime is 81100367. The next prime is 81100381. The reversal of 81100379 is 97300118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81100379 - 2⁴ = 81100363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81100339) 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 7 ways as a sum of consecutive naturals, for example, 24137 + ... + 27290.

It is an arithmetic number, because the mean of its divisors is an integer number (10799880).

Almost surely, 2^81100379 is an apocalyptic number.

81100379 is a deficient number, since it is larger than the sum of its proper divisors (5298661).

81100379 is a wasteful number, since it uses less digits than its factorization.

81100379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51529.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 81100379 is about 9005.5748844813. The cubic root of 81100379 is about 432.8535276455.

The spelling of 81100379 in words is "eighty-one million, one hundred thousand, three hundred seventy-nine".