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250001 = 53289
BaseRepresentation
bin111101000010010001
3110200221022
4331002101
531000001
65205225
72060603
oct750221
9420838
10250001
11160914
12100815
1389a3b
1467173
154e11b
hex3d091

250001 has 6 divisors (see below), whose sum is σ = 257670. Its totient is φ = 242528.

The previous prime is 249989. The next prime is 250007. The reversal of 250001 is 100052.

It is a Cunningham number, because it is equal to 5002+1.

It can be written as a sum of positive squares in 3 ways, for example, as 48400 + 201601 = 220^2 + 449^2 .

It is not a de Polignac number, because 250001 - 214 = 233617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (250007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2765 + ... + 2853.

It is an arithmetic number, because the mean of its divisors is an integer number (42945).

250001 is a Friedman number, since it can be written as 500^2+1+0, using all its digits and the basic arithmetic operations.

2250001 is an apocalyptic number.

It is an amenable number.

250001 is a deficient number, since it is larger than the sum of its proper divisors (7669).

250001 is an frugal number, since it uses more digits than its factorization.

250001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 250001 is about 500.0009999990. Note that the first 3 decimals coincide. The cubic root of 250001 is about 62.9961364894.

Adding to 250001 its reverse (100052), we get a palindrome (350053).

The spelling of 250001 in words is "two hundred fifty thousand, one".

Divisors: 1 53 89 2809 4717 250001