851225 has 12 divisors (see below), whose sum is σ = 1071360. Its totient is φ = 670800.

The previous prime is 851209. The next prime is 851231. The reversal of 851225 is 522158.

It is not a de Polignac number, because 851225 - 2⁴ = 851209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 851225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1760 + ... + 2190.

It is an arithmetic number, because the mean of its divisors is an integer number (89280).

2⁸⁵¹²²⁵ is an apocalyptic number.

It is an amenable number.

851225 is a deficient number, since it is larger than the sum of its proper divisors (220135).

851225 is a wasteful number, since it uses less digits than its factorization.

851225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 515 counting only the distinct ones).

The product of its digits is 800, while the sum is 23.

The square root of 851225 is about 922.6185560675. The cubic root of 851225 is about 94.7723078985.

The spelling of 851225 in words is "eight hundred fifty-one thousand, two hundred twenty-five".