851251 has 2 divisors, whose sum is σ = 851252. Its totient is φ = 851250.

The previous prime is 851239. The next prime is 851261. The reversal of 851251 is 152158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 851251 - 2¹¹ = 849203 is a prime.

It is not a weakly prime, because it can be changed into another prime (851231) 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 as a sum of consecutive naturals, namely, 425625 + 425626.

It is an arithmetic number, because the mean of its divisors is an integer number (425626).

2⁸⁵¹²⁵¹ is an apocalyptic number.

851251 is a deficient number, since it is larger than the sum of its proper divisors (1).

851251 is an equidigital number, since it uses as much as digits as its factorization.

851251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 400, while the sum is 22.

The square root of 851251 is about 922.6326462900. The cubic root of 851251 is about 94.7732728039.

The spelling of 851251 in words is "eight hundred fifty-one thousand, two hundred fifty-one".