81088481 has 2 divisors, whose sum is σ = 81088482. Its totient is φ = 81088480.

The previous prime is 81088471. The next prime is 81088507. The reversal of 81088481 is 18488018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78499600 + 2588881 = 8860^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 81088481 - 2⁶ = 81088417 is a prime.

It is a super-2 number, since 2×81088481² = 13150683501774722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81088471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40544240 + 40544241.

It is an arithmetic number, because the mean of its divisors is an integer number (40544241).

Almost surely, 2^81088481 is an apocalyptic number.

It is an amenable number.

81088481 is a deficient number, since it is larger than the sum of its proper divisors (1).

81088481 is an equidigital number, since it uses as much as digits as its factorization.

81088481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16384, while the sum is 38.

The square root of 81088481 is about 9004.9142694420. The cubic root of 81088481 is about 432.8323590509.

The spelling of 81088481 in words is "eighty-one million, eighty-eight thousand, four hundred eighty-one".