81126722 has 8 divisors (see below), whose sum is σ = 121728972. Its totient is φ = 40550400.

The previous prime is 81126709. The next prime is 81126733. The reversal of 81126722 is 22762118.

It can be written as a sum of positive squares in 2 ways, for example, as 80263681 + 863041 = 8959^2 + 929^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6722 + ... + 14402.

Almost surely, 2^81126722 is an apocalyptic number.

81126722 is a deficient number, since it is larger than the sum of its proper divisors (40602250).

81126722 is a wasteful number, since it uses less digits than its factorization.

81126722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12964.

The product of its digits is 2688, while the sum is 29.

The square root of 81126722 is about 9007.0373597538. The cubic root of 81126722 is about 432.9003890217.

The spelling of 81126722 in words is "eighty-one million, one hundred twenty-six thousand, seven hundred twenty-two".