81059493 has 16 divisors (see below), whose sum is σ = 110094336. Its totient is φ = 53039280.

The previous prime is 81059471. The next prime is 81059507. The reversal of 81059493 is 39495018.

It is not a de Polignac number, because 81059493 - 2¹⁰ = 81058469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81059413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55296 + ... + 56742.

It is an arithmetic number, because the mean of its divisors is an integer number (6880896).

Almost surely, 2^81059493 is an apocalyptic number.

It is an amenable number.

81059493 is a deficient number, since it is larger than the sum of its proper divisors (29034843).

81059493 is a wasteful number, since it uses less digits than its factorization.

81059493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 81059493 is about 9003.3045599935. The cubic root of 81059493 is about 432.7807757282.

It can be divided in two parts, 8 and 1059493, that added together give a palindrome (1059501).

The spelling of 81059493 in words is "eighty-one million, fifty-nine thousand, four hundred ninety-three".