851425 has 6 divisors (see below), whose sum is σ = 1055798. Its totient is φ = 681120.

The previous prime is 851423. The next prime is 851449. The reversal of 851425 is 524158.

It can be written as a sum of positive squares in 3 ways, for example, as 159201 + 692224 = 399^2 + 832^2 .

It is not a de Polignac number, because 851425 - 2¹ = 851423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 34057 = 851425 / (8 + 5 + 1 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 851425.

It is not an unprimeable number, because it can be changed into a prime (851423) 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, 17004 + ... + 17053.

2⁸⁵¹⁴²⁵ is an apocalyptic number.

It is an amenable number.

851425 is a deficient number, since it is larger than the sum of its proper divisors (204373).

851425 is a wasteful number, since it uses less digits than its factorization.

851425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34067 (or 34062 counting only the distinct ones).

The product of its digits is 1600, while the sum is 25.

The square root of 851425 is about 922.7269368562. The cubic root of 851425 is about 94.7797297424.

It can be divided in two parts, 851 and 425, that multiplied together give a triangular number (361675 = T₈₅₀).

The spelling of 851425 in words is "eight hundred fifty-one thousand, four hundred twenty-five".