851381671 has 4 divisors (see below), whose sum is σ = 973007632. Its totient is φ = 729755712.

The previous prime is 851381651. The next prime is 851381683. The reversal of 851381671 is 176183158.

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

It is not a de Polignac number, because 851381671 - 2¹⁷ = 851250599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851381611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60812970 + ... + 60812983.

It is an arithmetic number, because the mean of its divisors is an integer number (243251908).

Almost surely, 2^851381671 is an apocalyptic number.

851381671 is a deficient number, since it is larger than the sum of its proper divisors (121625961).

851381671 is a wasteful number, since it uses less digits than its factorization.

851381671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121625960.

The product of its digits is 40320, while the sum is 40.

The square root of 851381671 is about 29178.4453149924. The cubic root of 851381671 is about 947.7812193568.

The spelling of 851381671 in words is "eight hundred fifty-one million, three hundred eighty-one thousand, six hundred seventy-one".