81751422 has 8 divisors (see below), whose sum is σ = 163502856. Its totient is φ = 27250472.

The previous prime is 81751421. The next prime is 81751427. The reversal of 81751422 is 22415718.

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

81751422 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81751422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81751421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6812613 + ... + 6812624.

It is an arithmetic number, because the mean of its divisors is an integer number (20437857).

Almost surely, 2^81751422 is an apocalyptic number.

81751422 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81751422 is a wasteful number, since it uses less digits than its factorization.

81751422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13625242.

The product of its digits is 4480, while the sum is 30.

The square root of 81751422 is about 9041.6492964503. The cubic root of 81751422 is about 434.0087032028.

The spelling of 81751422 in words is "eighty-one million, seven hundred fifty-one thousand, four hundred twenty-two".