81966301 has 2 divisors, whose sum is σ = 81966302. Its totient is φ = 81966300.

The previous prime is 81966277. The next prime is 81966329. The reversal of 81966301 is 10366918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70056900 + 11909401 = 8370^2 + 3451^2 .

It is a cyclic number.

It is not a de Polignac number, because 81966301 - 2¹⁹ = 81442013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81966331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40983150 + 40983151.

It is an arithmetic number, because the mean of its divisors is an integer number (40983151).

Almost surely, 2^81966301 is an apocalyptic number.

It is an amenable number.

81966301 is a deficient number, since it is larger than the sum of its proper divisors (1).

81966301 is an equidigital number, since it uses as much as digits as its factorization.

81966301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 81966301 is about 9053.5242309280. The cubic root of 81966301 is about 434.3886263241.

The spelling of 81966301 in words is "eighty-one million, nine hundred sixty-six thousand, three hundred one".