81589223 has 2 divisors, whose sum is σ = 81589224. Its totient is φ = 81589222.

The previous prime is 81589217. The next prime is 81589229. The reversal of 81589223 is 32298518.

It is a balanced prime because it is at equal distance from previous prime (81589217) and next prime (81589229).

It is a cyclic number.

It is not a de Polignac number, because 81589223 - 2⁶ = 81589159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81589229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40794611 + 40794612.

It is an arithmetic number, because the mean of its divisors is an integer number (40794612).

Almost surely, 2^81589223 is an apocalyptic number.

81589223 is a deficient number, since it is larger than the sum of its proper divisors (1).

81589223 is an equidigital number, since it uses as much as digits as its factorization.

81589223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 81589223 is about 9032.6752958357. The cubic root of 81589223 is about 433.7214813474.

The spelling of 81589223 in words is "eighty-one million, five hundred eighty-nine thousand, two hundred twenty-three".