81120826 has 4 divisors (see below), whose sum is σ = 121681242. Its totient is φ = 40560412.

The previous prime is 81120791. The next prime is 81120827. The reversal of 81120826 is 62802118.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 75603025 + 5517801 = 8695^2 + 2349^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81120794 and 81120803.

It is not an unprimeable number, because it can be changed into a prime (81120827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20280205 + ... + 20280208.

Almost surely, 2^81120826 is an apocalyptic number.

81120826 is a deficient number, since it is larger than the sum of its proper divisors (40560416).

81120826 is a wasteful number, since it uses less digits than its factorization.

81120826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40560415.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 81120826 is about 9006.7100541763. The cubic root of 81120826 is about 432.8899015503.

The spelling of 81120826 in words is "eighty-one million, one hundred twenty thousand, eight hundred twenty-six".