81255241 has 2 divisors, whose sum is σ = 81255242. Its totient is φ = 81255240.

The previous prime is 81255221. The next prime is 81255253. The reversal of 81255241 is 14255218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79281216 + 1974025 = 8904^2 + 1405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81255241 is a prime.

It is not a weakly prime, because it can be changed into another prime (81255221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40627620 + 40627621.

It is an arithmetic number, because the mean of its divisors is an integer number (40627621).

Almost surely, 2^81255241 is an apocalyptic number.

It is an amenable number.

81255241 is a deficient number, since it is larger than the sum of its proper divisors (1).

81255241 is an equidigital number, since it uses as much as digits as its factorization.

81255241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200, while the sum is 28.

The square root of 81255241 is about 9014.1689023448. The cubic root of 81255241 is about 433.1288652069.

It can be divided in two parts, 8125 and 5241, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 81255241 in words is "eighty-one million, two hundred fifty-five thousand, two hundred forty-one".