81803297 has 2 divisors, whose sum is σ = 81803298. Its totient is φ = 81803296.

The previous prime is 81803291. The next prime is 81803311. The reversal of 81803297 is 79230818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42915601 + 38887696 = 6551^2 + 6236^2 .

It is a cyclic number.

It is not a de Polignac number, because 81803297 - 2²⁴ = 65026081 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81803297.

It is not a weakly prime, because it can be changed into another prime (81803291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40901648 + 40901649.

It is an arithmetic number, because the mean of its divisors is an integer number (40901649).

Almost surely, 2^81803297 is an apocalyptic number.

It is an amenable number.

81803297 is a deficient number, since it is larger than the sum of its proper divisors (1).

81803297 is an equidigital number, since it uses as much as digits as its factorization.

81803297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 81803297 is about 9044.5175106249. The cubic root of 81803297 is about 434.1004832212.

The spelling of 81803297 in words is "eighty-one million, eight hundred three thousand, two hundred ninety-seven".