856549097 has 4 divisors (see below), whose sum is σ = 906934356. Its totient is φ = 806163840.

The previous prime is 856549093. The next prime is 856549117. The reversal of 856549097 is 790945658.

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 517289536 + 339259561 = 22744^2 + 18419^2 .

It is a cyclic number.

It is not a de Polignac number, because 856549097 - 2² = 856549093 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856549093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25192604 + ... + 25192637.

It is an arithmetic number, because the mean of its divisors is an integer number (226733589).

Almost surely, 2^856549097 is an apocalyptic number.

It is an amenable number.

856549097 is a deficient number, since it is larger than the sum of its proper divisors (50385259).

856549097 is a wasteful number, since it uses less digits than its factorization.

856549097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50385258.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The square root of 856549097 is about 29266.8600468175. The cubic root of 856549097 is about 949.6948593398.

The spelling of 856549097 in words is "eight hundred fifty-six million, five hundred forty-nine thousand, ninety-seven".