250409 has 2 divisors, whose sum is σ = 250410. Its totient is φ = 250408.

The previous prime is 250403. The next prime is 250423. The reversal of 250409 is 904052.

250409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211600 + 38809 = 460^2 + 197^2 .

It is a cyclic number.

It is not a de Polignac number, because 250409 - 2⁸ = 250153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125204 + 125205.

It is an arithmetic number, because the mean of its divisors is an integer number (125205).

2²⁵⁰⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

250409 is a deficient number, since it is larger than the sum of its proper divisors (1).

250409 is an equidigital number, since it uses as much as digits as its factorization.

250409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 250409 is about 500.4088328557. The cubic root of 250409 is about 63.0303876247.

The spelling of 250409 in words is "two hundred fifty thousand, four hundred nine".