81351426 has 64 divisors (see below), whose sum is σ = 195350400. Its totient is φ = 22311936.

The previous prime is 81351379. The next prime is 81351451. The reversal of 81351426 is 62415318.

It is a junction number, because it is equal to n+sod(n) for n = 81351393 and 81351402.

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 31 ways as a sum of consecutive naturals, for example, 23580 + ... + 26808.

It is an arithmetic number, because the mean of its divisors is an integer number (3052350).

Almost surely, 2^81351426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81351426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97675200).

81351426 is an abundant number, since it is smaller than the sum of its proper divisors (113998974).

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

81351426 is a wasteful number, since it uses less digits than its factorization.

81351426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283.

The product of its digits is 5760, while the sum is 30.

The square root of 81351426 is about 9019.5025361713. The cubic root of 81351426 is about 433.2997016634.

The spelling of 81351426 in words is "eighty-one million, three hundred fifty-one thousand, four hundred twenty-six".