258389321 has 2 divisors, whose sum is σ = 258389322. Its totient is φ = 258389320.

The previous prime is 258389317. The next prime is 258389323. The reversal of 258389321 is 123983852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138180025 + 120209296 = 11755^2 + 10964^2 .

It is a cyclic number.

It is not a de Polignac number, because 258389321 - 2² = 258389317 is a prime.

It is a Sophie Germain prime.

Together with 258389323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (258389323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129194660 + 129194661.

It is an arithmetic number, because the mean of its divisors is an integer number (129194661).

Almost surely, 2^258389321 is an apocalyptic number.

It is an amenable number.

258389321 is a deficient number, since it is larger than the sum of its proper divisors (1).

258389321 is an equidigital number, since it uses as much as digits as its factorization.

258389321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 258389321 is about 16074.4928691390. The cubic root of 258389321 is about 636.9297289540.

The spelling of 258389321 in words is "two hundred fifty-eight million, three hundred eighty-nine thousand, three hundred twenty-one".