81119289 has 4 divisors (see below), whose sum is σ = 108159056. Its totient is φ = 54079524.

The previous prime is 81119267. The next prime is 81119299. The reversal of 81119289 is 98291118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81119289 - 2⁹ = 81118777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81119209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13519879 + ... + 13519884.

It is an arithmetic number, because the mean of its divisors is an integer number (27039764).

Almost surely, 2^81119289 is an apocalyptic number.

It is an amenable number.

81119289 is a deficient number, since it is larger than the sum of its proper divisors (27039767).

81119289 is a wasteful number, since it uses less digits than its factorization.

81119289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27039766.

The product of its digits is 10368, while the sum is 39.

The square root of 81119289 is about 9006.6247284985. The cubic root of 81119289 is about 432.8871675381.

It can be divided in two parts, 811 and 19289, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 81119289 in words is "eighty-one million, one hundred nineteen thousand, two hundred eighty-nine".