81073399 has 8 divisors (see below), whose sum is σ = 93098880. Its totient is φ = 69823800.

The previous prime is 81073397. The next prime is 81073403. The reversal of 81073399 is 99337018.

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

It is a cyclic number.

It is not a de Polignac number, because 81073399 - 2¹ = 81073397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81073397) 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, 193747 + ... + 194164.

It is an arithmetic number, because the mean of its divisors is an integer number (11637360).

Almost surely, 2^81073399 is an apocalyptic number.

81073399 is a deficient number, since it is larger than the sum of its proper divisors (12025481).

81073399 is a wasteful number, since it uses less digits than its factorization.

81073399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387941.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 81073399 is about 9004.0767988728. The cubic root of 81073399 is about 432.8055225947.

The spelling of 81073399 in words is "eighty-one million, seventy-three thousand, three hundred ninety-nine".