258649 has 4 divisors (see below), whose sum is σ = 260260. Its totient is φ = 257040.

The previous prime is 258637. The next prime is 258659. The reversal of 258649 is 946852.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8649 + 250000 = 93^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 258649 - 2⁵ = 258617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258659) 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 in 3 ways as a sum of consecutive naturals, for example, 534 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (65065).

2²⁵⁸⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

258649 is a deficient number, since it is larger than the sum of its proper divisors (1611).

258649 is a wasteful number, since it uses less digits than its factorization.

258649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610.

The product of its digits is 17280, while the sum is 34.

The square root of 258649 is about 508.5754614607. The cubic root of 258649 is about 63.7143027112.

It can be divided in two parts, 25 and 8649, that multiplied together give a square (216225 = 465²).

The spelling of 258649 in words is "two hundred fifty-eight thousand, six hundred forty-nine".