81004097 has 2 divisors, whose sum is σ = 81004098. Its totient is φ = 81004096.

The previous prime is 81004073. The next prime is 81004111. The reversal of 81004097 is 79040018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47872561 + 33131536 = 6919^2 + 5756^2 .

It is a cyclic number.

It is not a de Polignac number, because 81004097 - 2¹² = 81000001 is a prime.

It is not a weakly prime, because it can be changed into another prime (81004067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40502048 + 40502049.

It is an arithmetic number, because the mean of its divisors is an integer number (40502049).

Almost surely, 2^81004097 is an apocalyptic number.

It is an amenable number.

81004097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81004097 is an equidigital number, since it uses as much as digits as its factorization.

81004097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 81004097 is about 9000.2276082330. The cubic root of 81004097 is about 432.6821659032.

The spelling of 81004097 in words is "eighty-one million, four thousand, ninety-seven".