81846841 has 2 divisors, whose sum is σ = 81846842. Its totient is φ = 81846840.

The previous prime is 81846839. The next prime is 81846847. The reversal of 81846841 is 14864818.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78943225 + 2903616 = 8885^2 + 1704^2 .

It is a cyclic number.

It is not a de Polignac number, because 81846841 - 2¹ = 81846839 is a prime.

Together with 81846839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 81846794 and 81846803.

It is not a weakly prime, because it can be changed into another prime (81846847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40923420 + 40923421.

It is an arithmetic number, because the mean of its divisors is an integer number (40923421).

Almost surely, 2^81846841 is an apocalyptic number.

It is an amenable number.

81846841 is a deficient number, since it is larger than the sum of its proper divisors (1).

81846841 is an equidigital number, since it uses as much as digits as its factorization.

81846841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49152, while the sum is 40.

The square root of 81846841 is about 9046.9243945111. The cubic root of 81846841 is about 434.1774936401.

The spelling of 81846841 in words is "eighty-one million, eight hundred forty-six thousand, eight hundred forty-one".