851687201 has 8 divisors (see below), whose sum is σ = 875084520. Its totient is φ = 828309888.

The previous prime is 851687189. The next prime is 851687209. The reversal of 851687201 is 102786158.

851687201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 159997201 + 691690000 = 12649^2 + 26300^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851687201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (851687209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131405 + ... + 137733.

It is an arithmetic number, because the mean of its divisors is an integer number (109385565).

Almost surely, 2^851687201 is an apocalyptic number.

It is an amenable number.

851687201 is a deficient number, since it is larger than the sum of its proper divisors (23397319).

851687201 is a wasteful number, since it uses less digits than its factorization.

851687201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10003.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 851687201 is about 29183.6803881896. The cubic root of 851687201 is about 947.8945805646.

The spelling of 851687201 in words is "eight hundred fifty-one million, six hundred eighty-seven thousand, two hundred one".