81208373 has 4 divisors (see below), whose sum is σ = 81240960. Its totient is φ = 81175788.

The previous prime is 81208363. The next prime is 81208397. The reversal of 81208373 is 37380218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37380218 = 2 ⋅18690109.

It is a cyclic number.

It is not a de Polignac number, because 81208373 - 2⁴ = 81208357 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 (81208333) 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 3 ways as a sum of consecutive naturals, for example, 12215 + ... + 17652.

It is an arithmetic number, because the mean of its divisors is an integer number (20310240).

Almost surely, 2^81208373 is an apocalyptic number.

It is an amenable number.

81208373 is a deficient number, since it is larger than the sum of its proper divisors (32587).

81208373 is a wasteful number, since it uses less digits than its factorization.

81208373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32586.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 81208373 is about 9011.5688423271. The cubic root of 81208373 is about 433.0455729883.

The spelling of 81208373 in words is "eighty-one million, two hundred eight thousand, three hundred seventy-three".