2578390121 has 2 divisors, whose sum is σ = 2578390122. Its totient is φ = 2578390120.

The previous prime is 2578390099. The next prime is 2578390141. The reversal of 2578390121 is 1210938752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2282928400 + 295461721 = 47780^2 + 17189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2578390121 - 2¹⁴ = 2578373737 is a prime.

It is not a weakly prime, because it can be changed into another prime (2578390141) by changing a digit.

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 as a sum of consecutive naturals, namely, 1289195060 + 1289195061.

It is an arithmetic number, because the mean of its divisors is an integer number (1289195061).

Almost surely, 2^2578390121 is an apocalyptic number.

It is an amenable number.

2578390121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2578390121 is an equidigital number, since it uses as much as digits as its factorization.

2578390121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 2578390121 is about 50777.8506929941. The cubic root of 2578390121 is about 1371.2486389180.

The spelling of 2578390121 in words is "two billion, five hundred seventy-eight million, three hundred ninety thousand, one hundred twenty-one".