81262054241 has 2 divisors, whose sum is σ = 81262054242. Its totient is φ = 81262054240.

The previous prime is 81262054183. The next prime is 81262054267. The reversal of 81262054241 is 14245026218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81262054225 + 16 = 285065^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 81262054241 - 2³⁰ = 80188312417 is a prime.

It is not a weakly prime, because it can be changed into another prime (81262054441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40631027120 + 40631027121.

It is an arithmetic number, because the mean of its divisors is an integer number (40631027121).

Almost surely, 2^81262054241 is an apocalyptic number.

It is an amenable number.

81262054241 is a deficient number, since it is larger than the sum of its proper divisors (1).

81262054241 is an equidigital number, since it uses as much as digits as its factorization.

81262054241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 35.

The spelling of 81262054241 in words is "eighty-one billion, two hundred sixty-two million, fifty-four thousand, two hundred forty-one".