81843119 has 2 divisors, whose sum is σ = 81843120. Its totient is φ = 81843118.

The previous prime is 81843109. The next prime is 81843137. The reversal of 81843119 is 91134818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81843119 - 2⁴ = 81843103 is a prime.

It is a super-2 number, since 2×81843119² = 13396592255296322, which contains 22 as substring.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81843109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40921559 + 40921560.

It is an arithmetic number, because the mean of its divisors is an integer number (40921560).

Almost surely, 2^81843119 is an apocalyptic number.

81843119 is a deficient number, since it is larger than the sum of its proper divisors (1).

81843119 is an equidigital number, since it uses as much as digits as its factorization.

81843119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 35.

The square root of 81843119 is about 9046.7186869052. The cubic root of 81843119 is about 434.1709121068.

The spelling of 81843119 in words is "eighty-one million, eight hundred forty-three thousand, one hundred nineteen".