81352555 has 8 divisors (see below), whose sum is σ = 97671744. Its totient is φ = 65049600.

The previous prime is 81352553. The next prime is 81352559. The reversal of 81352555 is 55525318.

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

It is not a de Polignac number, because 81352555 - 2¹ = 81352553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81352555.

It is not an unprimeable number, because it can be changed into a prime (81352553) 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, 15915 + ... + 20395.

It is an arithmetic number, because the mean of its divisors is an integer number (12208968).

Almost surely, 2^81352555 is an apocalyptic number.

81352555 is a deficient number, since it is larger than the sum of its proper divisors (16319189).

81352555 is a wasteful number, since it uses less digits than its factorization.

81352555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8117.

The product of its digits is 30000, while the sum is 34.

The square root of 81352555 is about 9019.5651225544. The cubic root of 81352555 is about 433.3017061072.

The spelling of 81352555 in words is "eighty-one million, three hundred fifty-two thousand, five hundred fifty-five".