851257 has 8 divisors (see below), whose sum is σ = 977760. Its totient is φ = 732960.

The previous prime is 851251. The next prime is 851261. The reversal of 851257 is 752158.

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-851257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (851251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1828 + ... + 2245.

It is an arithmetic number, because the mean of its divisors is an integer number (122220).

2⁸⁵¹²⁵⁷ is an apocalyptic number.

It is an amenable number.

851257 is a deficient number, since it is larger than the sum of its proper divisors (126503).

851257 is a wasteful number, since it uses less digits than its factorization.

851257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4103.

The product of its digits is 2800, while the sum is 28.

The square root of 851257 is about 922.6358978492. The cubic root of 851257 is about 94.7734954716.

Subtracting from 851257 its reverse (752158), we obtain a palindrome (99099).

The spelling of 851257 in words is "eight hundred fifty-one thousand, two hundred fifty-seven".