81096381 has 12 divisors (see below), whose sum is σ = 117439452. Its totient is φ = 53925696.

The previous prime is 81096359. The next prime is 81096391. The reversal of 81096381 is 18369018.

81096381 is a `hidden beast` number, since 8 + 10 + 9 + 638 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18844281 + 62252100 = 4341^2 + 7890^2 .

It is not a de Polignac number, because 81096381 - 2¹⁴ = 81079997 is a prime.

It is a super-2 number, since 2×81096381² = 13153246022594322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81096391) 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 11 ways as a sum of consecutive naturals, for example, 7776 + ... + 14921.

It is an arithmetic number, because the mean of its divisors is an integer number (9786621).

Almost surely, 2^81096381 is an apocalyptic number.

It is an amenable number.

81096381 is a deficient number, since it is larger than the sum of its proper divisors (36343071).

81096381 is a wasteful number, since it uses less digits than its factorization.

81096381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23100 (or 23097 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 81096381 is about 9005.3529081319. The cubic root of 81096381 is about 432.8464147448.

The spelling of 81096381 in words is "eighty-one million, ninety-six thousand, three hundred eighty-one".