851997563 has 8 divisors (see below), whose sum is σ = 905548800. Its totient is φ = 799317288.

The previous prime is 851997547. The next prime is 851997569. The reversal of 851997563 is 365799158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 851997563 - 2⁴ = 851997547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851997569) 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 7 ways as a sum of consecutive naturals, for example, 215723 + ... + 219636.

It is an arithmetic number, because the mean of its divisors is an integer number (113193600).

Almost surely, 2^851997563 is an apocalyptic number.

851997563 is a deficient number, since it is larger than the sum of its proper divisors (53551237).

851997563 is a wasteful number, since it uses less digits than its factorization.

851997563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435481.

The product of its digits is 2041200, while the sum is 53.

The square root of 851997563 is about 29188.9972935009. The cubic root of 851997563 is about 948.0097068416.

The spelling of 851997563 in words is "eight hundred fifty-one million, nine hundred ninety-seven thousand, five hundred sixty-three".