81184459 has 2 divisors, whose sum is σ = 81184460. Its totient is φ = 81184458.

The previous prime is 81184409. The next prime is 81184471. The reversal of 81184459 is 95448118.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81184459 - 2⁷ = 81184331 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81184409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40592229 + 40592230.

It is an arithmetic number, because the mean of its divisors is an integer number (40592230).

Almost surely, 2^81184459 is an apocalyptic number.

81184459 is a deficient number, since it is larger than the sum of its proper divisors (1).

81184459 is an equidigital number, since it uses as much as digits as its factorization.

81184459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 40.

The square root of 81184459 is about 9010.2418946441. The cubic root of 81184459 is about 433.0030614913.

The spelling of 81184459 in words is "eighty-one million, one hundred eighty-four thousand, four hundred fifty-nine".