81226857 has 16 divisors (see below), whose sum is σ = 110898432. Its totient is φ = 52859520.

The previous prime is 81226841. The next prime is 81226897. The reversal of 81226857 is 75862218.

It is not a de Polignac number, because 81226857 - 2⁴ = 81226841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81226837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106357 + ... + 107117.

It is an arithmetic number, because the mean of its divisors is an integer number (6931152).

Almost surely, 2^81226857 is an apocalyptic number.

It is an amenable number.

81226857 is a deficient number, since it is larger than the sum of its proper divisors (29671575).

81226857 is a wasteful number, since it uses less digits than its factorization.

81226857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568.

The product of its digits is 53760, while the sum is 39.

The square root of 81226857 is about 9012.5943545685. The cubic root of 81226857 is about 433.0784259518.

The spelling of 81226857 in words is "eighty-one million, two hundred twenty-six thousand, eight hundred fifty-seven".