851161 has 6 divisors (see below), whose sum is σ = 890330. Its totient is φ = 813648.

The previous prime is 851159. The next prime is 851171. The reversal of 851161 is 161158.

It can be written as a sum of positive squares in only one way, i.e., 846400 + 4761 = 920^2 + 69^2 .

It is not a de Polignac number, because 851161 - 2¹ = 851159 is a prime.

851161 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (851131) 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 5 ways as a sum of consecutive naturals, for example, 276 + ... + 1333.

2⁸⁵¹¹⁶¹ is an apocalyptic number.

It is an amenable number.

851161 is a deficient number, since it is larger than the sum of its proper divisors (39169).

851161 is a wasteful number, since it uses less digits than its factorization.

851161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1655 (or 1632 counting only the distinct ones).

The product of its digits is 240, while the sum is 22.

The square root of 851161 is about 922.5838715261. The cubic root of 851161 is about 94.7699326629.

The spelling of 851161 in words is "eight hundred fifty-one thousand, one hundred sixty-one".