853997897 has 4 divisors (see below), whose sum is σ = 874827156. Its totient is φ = 833168640.

The previous prime is 853997861. The next prime is 853997909. The reversal of 853997897 is 798799358.

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 22886656 + 831111241 = 4784^2 + 28829^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853997897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (853997197) 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, 10414568 + ... + 10414649.

It is an arithmetic number, because the mean of its divisors is an integer number (218706789).

Almost surely, 2^853997897 is an apocalyptic number.

It is an amenable number.

853997897 is a deficient number, since it is larger than the sum of its proper divisors (20829259).

853997897 is a wasteful number, since it uses less digits than its factorization.

853997897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20829258.

The product of its digits is 34292160, while the sum is 65.

The square root of 853997897 is about 29223.2424107935. The cubic root of 853997897 is about 948.7510446031.

The spelling of 853997897 in words is "eight hundred fifty-three million, nine hundred ninety-seven thousand, eight hundred ninety-seven".