81945301 has 2 divisors, whose sum is σ = 81945302. Its totient is φ = 81945300.

The previous prime is 81945293. The next prime is 81945313. The reversal of 81945301 is 10354918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70392100 + 11553201 = 8390^2 + 3399^2 .

It is a cyclic number.

It is not a de Polignac number, because 81945301 - 2³ = 81945293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81945341) 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, 40972650 + 40972651.

It is an arithmetic number, because the mean of its divisors is an integer number (40972651).

Almost surely, 2^81945301 is an apocalyptic number.

It is an amenable number.

81945301 is a deficient number, since it is larger than the sum of its proper divisors (1).

81945301 is an equidigital number, since it uses as much as digits as its factorization.

81945301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 81945301 is about 9052.3643872747. The cubic root of 81945301 is about 434.3515259540.

The spelling of 81945301 in words is "eighty-one million, nine hundred forty-five thousand, three hundred one".