81100609417 has 2 divisors, whose sum is σ = 81100609418. Its totient is φ = 81100609416.

The previous prime is 81100609399. The next prime is 81100609453. The reversal of 81100609417 is 71490600118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78255027081 + 2845582336 = 279741^2 + 53344^2 .

It is a cyclic number.

It is not a de Polignac number, because 81100609417 - 2¹¹ = 81100607369 is a prime.

It is not a weakly prime, because it can be changed into another prime (81100649417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40550304708 + 40550304709.

It is an arithmetic number, because the mean of its divisors is an integer number (40550304709).

Almost surely, 2^81100609417 is an apocalyptic number.

It is an amenable number.

81100609417 is a deficient number, since it is larger than the sum of its proper divisors (1).

81100609417 is an equidigital number, since it uses as much as digits as its factorization.

81100609417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The spelling of 81100609417 in words is "eighty-one billion, one hundred million, six hundred nine thousand, four hundred seventeen".