81351192 has 96 divisors (see below), whose sum is σ = 227681280. Its totient is φ = 24186240.

The previous prime is 81351187. The next prime is 81351203. The reversal of 81351192 is 29115318.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125413 + ... + 126059.

It is an arithmetic number, because the mean of its divisors is an integer number (2371680).

Almost surely, 2^81351192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81351192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113840640).

81351192 is an abundant number, since it is smaller than the sum of its proper divisors (146330088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81351192 is a wasteful number, since it uses less digits than its factorization.

81351192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713 (or 696 counting only the distinct ones).

The product of its digits is 2160, while the sum is 30.

The square root of 81351192 is about 9019.4895642714. The cubic root of 81351192 is about 433.2992862139.

The spelling of 81351192 in words is "eighty-one million, three hundred fifty-one thousand, one hundred ninety-two".