250109 has 2 divisors, whose sum is σ = 250110. Its totient is φ = 250108.

The previous prime is 250091. The next prime is 250123. The reversal of 250109 is 901052.

Together with previous prime (250091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235225 + 14884 = 485^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 250109 - 2⁸ = 249853 is a prime.

It is a Chen prime.

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

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 250109.

It is not a weakly prime, because it can be changed into another prime (250169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125054 + 125055.

It is an arithmetic number, because the mean of its divisors is an integer number (125055).

2²⁵⁰¹⁰⁹ is an apocalyptic number.

It is an amenable number.

250109 is a deficient number, since it is larger than the sum of its proper divisors (1).

250109 is an equidigital number, since it uses as much as digits as its factorization.

250109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 250109 is about 500.1089881216. The cubic root of 250109 is about 63.0052065908.

The spelling of 250109 in words is "two hundred fifty thousand, one hundred nine".