81419 has 4 divisors (see below), whose sum is σ = 87696. Its totient is φ = 75144.

The previous prime is 81409. The next prime is 81421. The reversal of 81419 is 91418.

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 81419 - 2⁸ = 81163 is a prime.

It is a super-2 number, since 2×81419² = 13258107122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81394 and 81403.

It is not an unprimeable number, because it can be changed into a prime (81409) 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, 3119 + ... + 3144.

It is an arithmetic number, because the mean of its divisors is an integer number (21924).

2⁸¹⁴¹⁹ is an apocalyptic number.

81419 is a deficient number, since it is larger than the sum of its proper divisors (6277).

81419 is a wasteful number, since it uses less digits than its factorization.

81419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6276.

The product of its digits is 288, while the sum is 23.

The square root of 81419 is about 285.3401478937. The cubic root of 81419 is about 43.3419640929.

Subtracting 81419 from its reverse (91418), we obtain a palindrome (9999).

The spelling of 81419 in words is "eighty-one thousand, four hundred nineteen".