81552423 has 8 divisors (see below), whose sum is σ = 108885888. Its totient is φ = 54293624.

The previous prime is 81552421. The next prime is 81552431. The reversal of 81552423 is 32425518.

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 81552423 - 2¹ = 81552421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81552421) 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, 16065 + ... + 20522.

It is an arithmetic number, because the mean of its divisors is an integer number (13610736).

Almost surely, 2^81552423 is an apocalyptic number.

81552423 is a deficient number, since it is larger than the sum of its proper divisors (27333465).

81552423 is a wasteful number, since it uses less digits than its factorization.

81552423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37333.

The product of its digits is 9600, while the sum is 30.

The square root of 81552423 is about 9030.6380173275. The cubic root of 81552423 is about 433.6562629677.

The spelling of 81552423 in words is "eighty-one million, five hundred fifty-two thousand, four hundred twenty-three".