671896851 has 4 divisors (see below), whose sum is σ = 895862472. Its totient is φ = 447931232.

The previous prime is 671896843. The next prime is 671896877. The reversal of 671896851 is 158698176.

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

It is a cyclic number.

It is not a de Polignac number, because 671896851 - 2³ = 671896843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 671896794 and 671896803.

It is not an unprimeable number, because it can be changed into a prime (671896051) by changing a digit.

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, 111982806 + ... + 111982811.

It is an arithmetic number, because the mean of its divisors is an integer number (223965618).

Almost surely, 2^671896851 is an apocalyptic number.

671896851 is a deficient number, since it is larger than the sum of its proper divisors (223965621).

671896851 is a wasteful number, since it uses less digits than its factorization.

671896851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223965620.

The product of its digits is 725760, while the sum is 51.

The square root of 671896851 is about 25920.9731877490. The cubic root of 671896851 is about 875.8590099086.

The spelling of 671896851 in words is "six hundred seventy-one million, eight hundred ninety-six thousand, eight hundred fifty-one".