258781 has 4 divisors (see below), whose sum is σ = 260064. Its totient is φ = 257500.

The previous prime is 258779. The next prime is 258787. The reversal of 258781 is 187852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 258781 - 2¹ = 258779 is a prime.

It is a super-2 number, since 2×258781² = 133935211922, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁷ + 5⁷ + 7⁵ + 8 + 8⁵ + 1 .

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (65016).

2²⁵⁸⁷⁸¹ is an apocalyptic number.

258781 is the 228-th centered decagonal number.

It is an amenable number.

258781 is a deficient number, since it is larger than the sum of its proper divisors (1283).

258781 is a wasteful number, since it uses less digits than its factorization.

258781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282.

The product of its digits is 4480, while the sum is 31.

The square root of 258781 is about 508.7052191594. The cubic root of 258781 is about 63.7251396081.

The spelling of 258781 in words is "two hundred fifty-eight thousand, seven hundred eighty-one".