81098113 has 2 divisors, whose sum is σ = 81098114. Its totient is φ = 81098112.

The previous prime is 81098107. The next prime is 81098141. The reversal of 81098113 is 31189018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69422224 + 11675889 = 8332^2 + 3417^2 .

It is a cyclic number.

It is not a de Polignac number, because 81098113 - 2⁵ = 81098081 is a prime.

It is not a weakly prime, because it can be changed into another prime (81098153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40549056 + 40549057.

It is an arithmetic number, because the mean of its divisors is an integer number (40549057).

Almost surely, 2^81098113 is an apocalyptic number.

It is an amenable number.

81098113 is a deficient number, since it is larger than the sum of its proper divisors (1).

81098113 is an equidigital number, since it uses as much as digits as its factorization.

81098113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 81098113 is about 9005.4490726449. The cubic root of 81098113 is about 432.8494962002.

The spelling of 81098113 in words is "eighty-one million, ninety-eight thousand, one hundred thirteen".