81893159 has 2 divisors, whose sum is σ = 81893160. Its totient is φ = 81893158.

The previous prime is 81893153. The next prime is 81893177. The reversal of 81893159 is 95139818.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81893159 - 2⁴ = 81893143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81893153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40946579 + 40946580.

It is an arithmetic number, because the mean of its divisors is an integer number (40946580).

Almost surely, 2^81893159 is an apocalyptic number.

81893159 is a deficient number, since it is larger than the sum of its proper divisors (1).

81893159 is an equidigital number, since it uses as much as digits as its factorization.

81893159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 44.

The square root of 81893159 is about 9049.4839079364. The cubic root of 81893159 is about 434.2593800862.

The spelling of 81893159 in words is "eighty-one million, eight hundred ninety-three thousand, one hundred fifty-nine".