• 250 can be written using four 4's:

250 has 8 divisors (see below), whose sum is σ = 468. Its totient is φ = 100.

The previous prime is 241. The next prime is 251. The reversal of 250 is 52.

250 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in 2 ways, for example, as 169 + 81 = 13^2 + 9^2 .

It is a sliding number, since 250 = 50 + 200 and 1/50 + 1/200 = 0.0250.

It is a hoax number, since the sum of its digits (7) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

250 is an undulating number in base 7.

It is an enlightened number because it begins with the concatenation of its prime factors (25).

It is a plaindrome in base 12, base 14 and base 15.

It is a nialpdrome in base 4, base 5 and base 16.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48 + ... + 52.

250 is a deficient number, since it is larger than the sum of its proper divisors (218).

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

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

The sum of its prime factors is 17 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 7.

The square root of 250 is about 15.8113883008. The cubic root of 250 is about 6.2996052495.

Multiplying 250 by its product of nonzero digits (10), we get a square (2500 = 50^{2}).

250 divided by its product of nonzero digits (10) gives a square (25 = 5^{2}).

It can be divided in two parts, 2 and 50, that multiplied together give a square (100 = 10^{2}).

The spelling of 250 in words is "two hundred fifty", and thus it is an aban number.

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