2558321 has 2 divisors, whose sum is σ = 2558322. Its totient is φ = 2558320.

The previous prime is 2558317. The next prime is 2558323. The reversal of 2558321 is 1238552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2446096 + 112225 = 1564^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 2558321 - 2² = 2558317 is a prime.

Together with 2558323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2558323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1279160 + 1279161.

It is an arithmetic number, because the mean of its divisors is an integer number (1279161).

2^2558321 is an apocalyptic number.

It is an amenable number.

2558321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2558321 is an equidigital number, since it uses as much as digits as its factorization.

2558321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 2558321 is about 1599.4752264415. The cubic root of 2558321 is about 136.7681624267.

The spelling of 2558321 in words is "two million, five hundred fifty-eight thousand, three hundred twenty-one".