81919483 has 4 divisors (see below), whose sum is σ = 82277440. Its totient is φ = 81561528.

The previous prime is 81919477. The next prime is 81919501. The reversal of 81919483 is 38491918.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81919483 - 2⁵ = 81919451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81919433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178635 + ... + 179092.

It is an arithmetic number, because the mean of its divisors is an integer number (20569360).

Almost surely, 2^81919483 is an apocalyptic number.

81919483 is a deficient number, since it is larger than the sum of its proper divisors (357957).

81919483 is a wasteful number, since it uses less digits than its factorization.

81919483 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357956.

The product of its digits is 62208, while the sum is 43.

The square root of 81919483 is about 9050.9382386579. The cubic root of 81919483 is about 434.3059050114.

It can be divided in two parts, 819 and 19483, that added together give a palindrome (20302).

The spelling of 81919483 in words is "eighty-one million, nine hundred nineteen thousand, four hundred eighty-three".