851601 has 8 divisors (see below), whose sum is σ = 1172224. Its totient is φ = 549360.

The previous prime is 851597. The next prime is 851603. The reversal of 851601 is 106158.

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

It is not a de Polignac number, because 851601 - 2² = 851597 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 (851603) 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, 4486 + ... + 4671.

It is an arithmetic number, because the mean of its divisors is an integer number (146528).

2⁸⁵¹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

851601 is a deficient number, since it is larger than the sum of its proper divisors (320623).

851601 is a wasteful number, since it uses less digits than its factorization.

851601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9191.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 851601 is about 922.8223014210. The cubic root of 851601 is about 94.7862600037.

Adding to 851601 its reverse (106158), we get a palindrome (957759).

The spelling of 851601 in words is "eight hundred fifty-one thousand, six hundred one".