81038081 has 2 divisors, whose sum is σ = 81038082. Its totient is φ = 81038080.

The previous prime is 81038047. The next prime is 81038107. The reversal of 81038081 is 18083018.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80263681 + 774400 = 8959^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 81038081 - 2¹⁴ = 81021697 is a prime.

It is a super-2 number, since 2×81038081² = 13134341144325122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81038381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40519040 + 40519041.

It is an arithmetic number, because the mean of its divisors is an integer number (40519041).

Almost surely, 2^81038081 is an apocalyptic number.

It is an amenable number.

81038081 is a deficient number, since it is larger than the sum of its proper divisors (1).

81038081 is an equidigital number, since it uses as much as digits as its factorization.

81038081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 81038081 is about 9002.1153625134. The cubic root of 81038081 is about 432.7426657850.

The spelling of 81038081 in words is "eighty-one million, thirty-eight thousand, eighty-one".