81443595 has 16 divisors (see below), whose sum is σ = 137168640. Its totient is φ = 41150304.

The previous prime is 81443581. The next prime is 81443597. The reversal of 81443595 is 59534418.

It is not a de Polignac number, because 81443595 - 2¹⁴ = 81427211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81443597) 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, 142599 + ... + 143168.

It is an arithmetic number, because the mean of its divisors is an integer number (8573040).

Almost surely, 2^81443595 is an apocalyptic number.

81443595 is a deficient number, since it is larger than the sum of its proper divisors (55725045).

81443595 is a wasteful number, since it uses less digits than its factorization.

81443595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285794.

The product of its digits is 86400, while the sum is 39.

The square root of 81443595 is about 9024.6105179116. The cubic root of 81443595 is about 433.4632789117.

The spelling of 81443595 in words is "eighty-one million, four hundred forty-three thousand, five hundred ninety-five".