2558021 has 2 divisors, whose sum is σ = 2558022. Its totient is φ = 2558020.

The previous prime is 2558011. The next prime is 2558029. The reversal of 2558021 is 1208552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2512225 + 45796 = 1585^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 2558021 - 2⁶ = 2557957 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2558029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1279010 + 1279011.

It is an arithmetic number, because the mean of its divisors is an integer number (1279011).

2^2558021 is an apocalyptic number.

It is an amenable number.

2558021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2558021 is an equidigital number, since it uses as much as digits as its factorization.

2558021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 2558021 is about 1599.3814429335. The cubic root of 2558021 is about 136.7628162052.

The spelling of 2558021 in words is "two million, five hundred fifty-eight thousand, twenty-one".