81298522 has 16 divisors (see below), whose sum is σ = 130311720. Its totient is φ = 37905408.

The previous prime is 81298507. The next prime is 81298541. The reversal of 81298522 is 22589218.

It can be written as a sum of positive squares in 4 ways, for example, as 72777961 + 8520561 = 8531^2 + 2919^2 .

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 7 ways as a sum of consecutive naturals, for example, 7263 + ... + 14674.

Almost surely, 2^81298522 is an apocalyptic number.

81298522 is a deficient number, since it is larger than the sum of its proper divisors (49013198).

81298522 is a wasteful number, since it uses less digits than its factorization.

81298522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22065.

The product of its digits is 23040, while the sum is 37.

The square root of 81298522 is about 9016.5693032328. The cubic root of 81298522 is about 433.2057542902.

The spelling of 81298522 in words is "eighty-one million, two hundred ninety-eight thousand, five hundred twenty-two".