81814801 has 2 divisors, whose sum is σ = 81814802. Its totient is φ = 81814800.

The previous prime is 81814793. The next prime is 81814867. The reversal of 81814801 is 10841818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54774801 + 27040000 = 7401^2 + 5200^2 .

It is a cyclic number.

It is not a de Polignac number, because 81814801 - 2³ = 81814793 is a prime.

It is equal to p_4769221 and since 81814801 and 4769221 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (81814891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40907400 + 40907401.

It is an arithmetic number, because the mean of its divisors is an integer number (40907401).

Almost surely, 2^81814801 is an apocalyptic number.

It is an amenable number.

81814801 is a deficient number, since it is larger than the sum of its proper divisors (1).

81814801 is an equidigital number, since it uses as much as digits as its factorization.

81814801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 31.

The square root of 81814801 is about 9045.1534536458. The cubic root of 81814801 is about 434.1208314552.

The spelling of 81814801 in words is "eighty-one million, eight hundred fourteen thousand, eight hundred one".