81115834 has 8 divisors (see below), whose sum is σ = 121981428. Its totient is φ = 40455360.

The previous prime is 81115829. The next prime is 81115873. The reversal of 81115834 is 43851118.

It can be written as a sum of positive squares in 2 ways, for example, as 67815225 + 13300609 = 8235^2 + 3647^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 81115796 and 81115805.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50287 + ... + 51874.

Almost surely, 2^81115834 is an apocalyptic number.

81115834 is a deficient number, since it is larger than the sum of its proper divisors (40865594).

81115834 is a wasteful number, since it uses less digits than its factorization.

81115834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102560.

The product of its digits is 3840, while the sum is 31.

The square root of 81115834 is about 9006.4329231944. The cubic root of 81115834 is about 432.8810216657.

The spelling of 81115834 in words is "eighty-one million, one hundred fifteen thousand, eight hundred thirty-four".