81055277 has 2 divisors, whose sum is σ = 81055278. Its totient is φ = 81055276.

The previous prime is 81055259. The next prime is 81055279. The reversal of 81055277 is 77255018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48038761 + 33016516 = 6931^2 + 5746^2 .

It is a cyclic number.

It is not a de Polignac number, because 81055277 - 2¹² = 81051181 is a prime.

Together with 81055279, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81055279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40527638 + 40527639.

It is an arithmetic number, because the mean of its divisors is an integer number (40527639).

Almost surely, 2^81055277 is an apocalyptic number.

It is an amenable number.

81055277 is a deficient number, since it is larger than the sum of its proper divisors (1).

81055277 is an equidigital number, since it uses as much as digits as its factorization.

81055277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 81055277 is about 9003.0704206954. The cubic root of 81055277 is about 432.7732724517.

The spelling of 81055277 in words is "eighty-one million, fifty-five thousand, two hundred seventy-seven".