81059413 has 2 divisors, whose sum is σ = 81059414. Its totient is φ = 81059412.

The previous prime is 81059399. The next prime is 81059441. The reversal of 81059413 is 31495018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81036004 + 23409 = 9002^2 + 153^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81059413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81059113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40529706 + 40529707.

It is an arithmetic number, because the mean of its divisors is an integer number (40529707).

Almost surely, 2^81059413 is an apocalyptic number.

It is an amenable number.

81059413 is a deficient number, since it is larger than the sum of its proper divisors (1).

81059413 is an equidigital number, since it uses as much as digits as its factorization.

81059413 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 81059413 is about 9003.3001171793. The cubic root of 81059413 is about 432.7806333535.

The spelling of 81059413 in words is "eighty-one million, fifty-nine thousand, four hundred thirteen".