851681001 has 8 divisors (see below), whose sum is σ = 1135840384. Its totient is φ = 567654480.

The previous prime is 851680981. The next prime is 851681021. The reversal of 851681001 is 100186158.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (851680981) and next prime (851681021).

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

It is not a de Polignac number, because 851681001 - 2⁵ = 851680969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 851681001.

It is not an unprimeable number, because it can be changed into a prime (851681021) 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, 17146 + ... + 44691.

It is an arithmetic number, because the mean of its divisors is an integer number (141980048).

Almost surely, 2^851681001 is an apocalyptic number.

It is an amenable number.

851681001 is a deficient number, since it is larger than the sum of its proper divisors (284159383).

851681001 is a wasteful number, since it uses less digits than its factorization.

851681001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66431.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 851681001 is about 29183.5741642452. The cubic root of 851681001 is about 947.8922804397.

The spelling of 851681001 in words is "eight hundred fifty-one million, six hundred eighty-one thousand, one".