81846059 has 4 divisors (see below), whose sum is σ = 81981504. Its totient is φ = 81710616.

The previous prime is 81846043. The next prime is 81846101. The reversal of 81846059 is 95064818.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95064818 = 2 ⋅47532409.

It is a cyclic number.

It is not a de Polignac number, because 81846059 - 2⁴ = 81846043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81846559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66812 + ... + 68025.

It is an arithmetic number, because the mean of its divisors is an integer number (20495376).

Almost surely, 2^81846059 is an apocalyptic number.

81846059 is a deficient number, since it is larger than the sum of its proper divisors (135445).

81846059 is a wasteful number, since it uses less digits than its factorization.

81846059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135444.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 81846059 is about 9046.8811753001. The cubic root of 81846059 is about 434.1761108627.

The spelling of 81846059 in words is "eighty-one million, eight hundred forty-six thousand, fifty-nine".