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616225 = 521572
BaseRepresentation
bin10010110011100100001
31011022022011
42112130201
5124204400
621112521
75144401
oct2263441
91138264
10616225
11390a85
12258741
1318763c
14120801
15c28ba
hex96721

616225 has 9 divisors (see below), whose sum is σ = 769017. Its totient is φ = 489840.

The previous prime is 616223. The next prime is 616229. The reversal of 616225 is 522616.

The square root of 616225 is 785.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 74529 + 541696 = 273^2 + 736^2 .

It is not a de Polignac number, because 616225 - 21 = 616223 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 616196 and 616205.

It is not an unprimeable number, because it can be changed into a prime (616223) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3847 + ... + 4003.

616225 is a Friedman number, since it can be written as (56+(2+1)^6)^2, using all its digits and the basic arithmetic operations.

2616225 is an apocalyptic number.

616225 is the 785-th square number.

616225 is the 393-rd centered octagonal number.

It is an amenable number.

616225 is a deficient number, since it is larger than the sum of its proper divisors (152792).

616225 is an equidigital number, since it uses as much as digits as its factorization.

With its successor (616226) it forms an eRAP, since the sums of their prime factors are consecutive (324 and 325).

616225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 162 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The cubic root of 616225 is about 85.0967755888.

The spelling of 616225 in words is "six hundred sixteen thousand, two hundred twenty-five".

Divisors: 1 5 25 157 785 3925 24649 123245 616225