81055241 has 2 divisors, whose sum is σ = 81055242. Its totient is φ = 81055240.

The previous prime is 81055223. The next prime is 81055259. The reversal of 81055241 is 14255018.

It is a balanced prime because it is at equal distance from previous prime (81055223) and next prime (81055259).

It can be written as a sum of positive squares in only one way, i.e., 65286400 + 15768841 = 8080^2 + 3971^2 .

It is a cyclic number.

It is not a de Polignac number, because 81055241 - 2²⁶ = 13946377 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81055241.

It is not a weakly prime, because it can be changed into another prime (81055141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40527620 + 40527621.

It is an arithmetic number, because the mean of its divisors is an integer number (40527621).

Almost surely, 2^81055241 is an apocalyptic number.

It is an amenable number.

81055241 is a deficient number, since it is larger than the sum of its proper divisors (1).

81055241 is an equidigital number, since it uses as much as digits as its factorization.

81055241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 81055241 is about 9003.0684213772. The cubic root of 81055241 is about 432.7732083808.

The spelling of 81055241 in words is "eighty-one million, fifty-five thousand, two hundred forty-one".