258689945 has 4 divisors (see below), whose sum is σ = 310427940. Its totient is φ = 206951952.

The previous prime is 258689933. The next prime is 258689957. The reversal of 258689945 is 549986852.

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

It is an interprime number because it is at equal distance from previous prime (258689933) and next prime (258689957).

It can be written as a sum of positive squares in 2 ways, for example, as 188348176 + 70341769 = 13724^2 + 8387^2 .

It is a cyclic number.

It is not a de Polignac number, because 258689945 - 2⁴ = 258689929 is a prime.

It is a super-3 number, since 3×258689945³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25868990 + ... + 25868999.

It is an arithmetic number, because the mean of its divisors is an integer number (77606985).

Almost surely, 2^258689945 is an apocalyptic number.

It is an amenable number.

258689945 is a deficient number, since it is larger than the sum of its proper divisors (51737995).

258689945 is an equidigital number, since it uses as much as digits as its factorization.

258689945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51737994.

The product of its digits is 6220800, while the sum is 56.

The square root of 258689945 is about 16083.8411146094. The cubic root of 258689945 is about 637.1766459603.

The spelling of 258689945 in words is "two hundred fifty-eight million, six hundred eighty-nine thousand, nine hundred forty-five".