81226899 has 24 divisors (see below), whose sum is σ = 128746800. Its totient is φ = 49038912.

The previous prime is 81226897. The next prime is 81226939. The reversal of 81226899 is 99862218.

It is not a de Polignac number, because 81226899 - 2¹ = 81226897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81226897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 349 + ... + 12750.

It is an arithmetic number, because the mean of its divisors is an integer number (5364450).

Almost surely, 2^81226899 is an apocalyptic number.

81226899 is a deficient number, since it is larger than the sum of its proper divisors (47519901).

81226899 is a wasteful number, since it uses less digits than its factorization.

81226899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13171 (or 13168 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 81226899 is about 9012.5966846409. The cubic root of 81226899 is about 433.0785005958.

The spelling of 81226899 in words is "eighty-one million, two hundred twenty-six thousand, eight hundred ninety-nine".