81367319 has 8 divisors (see below), whose sum is σ = 89212800. Its totient is φ = 73596600.

The previous prime is 81367303. The next prime is 81367327. The reversal of 81367319 is 91376318.

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

It is not a de Polignac number, because 81367319 - 2⁴ = 81367303 is a prime.

It is a super-2 number, since 2×81367319² = 13241281202495522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81367619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16397 + ... + 20774.

It is an arithmetic number, because the mean of its divisors is an integer number (11151600).

Almost surely, 2^81367319 is an apocalyptic number.

81367319 is a deficient number, since it is larger than the sum of its proper divisors (7845481).

81367319 is a wasteful number, since it uses less digits than its factorization.

81367319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37381.

The product of its digits is 27216, while the sum is 38.

The square root of 81367319 is about 9020.3835284316. The cubic root of 81367319 is about 433.3279166318.

The spelling of 81367319 in words is "eighty-one million, three hundred sixty-seven thousand, three hundred nineteen".