258568421 has 2 divisors, whose sum is σ = 258568422. Its totient is φ = 258568420.

The previous prime is 258568393. The next prime is 258568423. The reversal of 258568421 is 124865852.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253255396 + 5313025 = 15914^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 258568421 - 2²⁶ = 191459557 is a prime.

Together with 258568423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258568423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129284210 + 129284211.

It is an arithmetic number, because the mean of its divisors is an integer number (129284211).

Almost surely, 2^258568421 is an apocalyptic number.

It is an amenable number.

258568421 is a deficient number, since it is larger than the sum of its proper divisors (1).

258568421 is an equidigital number, since it uses as much as digits as its factorization.

258568421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 153600, while the sum is 41.

The square root of 258568421 is about 16080.0628419170. The cubic root of 258568421 is about 637.0768554783.

The spelling of 258568421 in words is "two hundred fifty-eight million, five hundred sixty-eight thousand, four hundred twenty-one".