806257105 has 4 divisors (see below), whose sum is σ = 967508532. Its totient is φ = 645005680.

The previous prime is 806257097. The next prime is 806257171. The reversal of 806257105 is 501752608.

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

It can be written as a sum of positive squares in 2 ways, for example, as 109244304 + 697012801 = 10452^2 + 26401^2 .

It is not a de Polignac number, because 806257105 - 2³ = 806257097 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 80625706 + ... + 80625715.

It is an arithmetic number, because the mean of its divisors is an integer number (241877133).

Almost surely, 2^806257105 is an apocalyptic number.

It is an amenable number.

806257105 is a deficient number, since it is larger than the sum of its proper divisors (161251427).

806257105 is a wasteful number, since it uses less digits than its factorization.

806257105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161251426.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 806257105 is about 28394.6668407995. Note that the first 3 decimals coincide. The cubic root of 806257105 is about 930.7317265102.

The spelling of 806257105 in words is "eight hundred six million, two hundred fifty-seven thousand, one hundred five".