258123681 has 6 divisors (see below), whose sum is σ = 372845330. Its totient is φ = 172082448.

The previous prime is 258123667. The next prime is 258123713. The reversal of 258123681 is 186321852.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 257313681 + 810000 = 16041^2 + 900^2 .

It is not a de Polignac number, because 258123681 - 2⁶ = 258123617 is a prime.

It is a super-2 number, since 2×258123681² = 133255669385979522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (258123601) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14340196 + ... + 14340213.

Almost surely, 2^258123681 is an apocalyptic number.

It is an amenable number.

258123681 is a deficient number, since it is larger than the sum of its proper divisors (114721649).

258123681 is a wasteful number, since it uses less digits than its factorization.

258123681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28680415 (or 28680412 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 258123681 is about 16066.2279642734. The cubic root of 258123681 is about 636.7113865624.

It can be divided in two parts, 2581 and 23681, that added together give a palindrome (26262).

The spelling of 258123681 in words is "two hundred fifty-eight million, one hundred twenty-three thousand, six hundred eighty-one".