258109 has 2 divisors, whose sum is σ = 258110. Its totient is φ = 258108.

The previous prime is 258107. The next prime is 258113. The reversal of 258109 is 901852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205209 + 52900 = 453^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 258109 - 2¹ = 258107 is a prime.

Together with 258107, it forms a pair of twin primes.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129054 + 129055.

It is an arithmetic number, because the mean of its divisors is an integer number (129055).

2²⁵⁸¹⁰⁹ is an apocalyptic number.

It is an amenable number.

258109 is a deficient number, since it is larger than the sum of its proper divisors (1).

258109 is an equidigital number, since it uses as much as digits as its factorization.

258109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 258109 is about 508.0442894079. The cubic root of 258109 is about 63.6699315170.

The spelling of 258109 in words is "two hundred fifty-eight thousand, one hundred nine".