81488443 has 4 divisors (see below), whose sum is σ = 83476008. Its totient is φ = 79500880.

The previous prime is 81488423. The next prime is 81488447. The reversal of 81488443 is 34488418.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34488418 = 2 ⋅17244209.

It is a cyclic number.

It is not a de Polignac number, because 81488443 - 2¹³ = 81480251 is a prime.

It is a super-3 number, since 3×81488443³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81488396 and 81488405.

It is not an unprimeable number, because it can be changed into a prime (81488447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 993721 + ... + 993802.

It is an arithmetic number, because the mean of its divisors is an integer number (20869002).

Almost surely, 2^81488443 is an apocalyptic number.

81488443 is a deficient number, since it is larger than the sum of its proper divisors (1987565).

81488443 is a wasteful number, since it uses less digits than its factorization.

81488443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987564.

The product of its digits is 98304, while the sum is 40.

The square root of 81488443 is about 9027.0949369108. The cubic root of 81488443 is about 433.5428284205.

The spelling of 81488443 in words is "eighty-one million, four hundred eighty-eight thousand, four hundred forty-three".