81844801 has 2 divisors, whose sum is σ = 81844802. Its totient is φ = 81844800.

The previous prime is 81844771. The next prime is 81844843. The reversal of 81844801 is 10844818.

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., 81721600 + 123201 = 9040^2 + 351^2 .

It is a cyclic number.

It is not a de Polignac number, because 81844801 - 2⁷ = 81844673 is a prime.

It is not a weakly prime, because it can be changed into another prime (81844871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40922400 + 40922401.

It is an arithmetic number, because the mean of its divisors is an integer number (40922401).

Almost surely, 2^81844801 is an apocalyptic number.

It is an amenable number.

81844801 is a deficient number, since it is larger than the sum of its proper divisors (1).

81844801 is an equidigital number, since it uses as much as digits as its factorization.

81844801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 81844801 is about 9046.8116483101. The cubic root of 81844801 is about 434.1738863763.

The spelling of 81844801 in words is "eighty-one million, eight hundred forty-four thousand, eight hundred one".