81893319 has 8 divisors (see below), whose sum is σ = 109861632. Its totient is φ = 54260280.

The previous prime is 81893309. The next prime is 81893323. The reversal of 81893319 is 91339818.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81893319 - 2⁹ = 81892807 is a prime.

It is a super-2 number, since 2×81893319² = 13413031393671522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81893309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83247 + ... + 84224.

It is an arithmetic number, because the mean of its divisors is an integer number (13732704).

Almost surely, 2^81893319 is an apocalyptic number.

81893319 is a deficient number, since it is larger than the sum of its proper divisors (27968313).

81893319 is a wasteful number, since it uses less digits than its factorization.

81893319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167637.

The product of its digits is 46656, while the sum is 42.

The square root of 81893319 is about 9049.4927482152. The cubic root of 81893319 is about 434.2596628996.

The spelling of 81893319 in words is "eighty-one million, eight hundred ninety-three thousand, three hundred nineteen".