2556421249 has 2 divisors, whose sum is σ = 2556421250. Its totient is φ = 2556421248.

The previous prime is 2556421163. The next prime is 2556421297. The reversal of 2556421249 is 9421246552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2325168400 + 231252849 = 48220^2 + 15207^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556421249 - 2¹⁹ = 2555896961 is a prime.

It is not a weakly prime, because it can be changed into another prime (2556428249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278210624 + 1278210625.

It is an arithmetic number, because the mean of its divisors is an integer number (1278210625).

Almost surely, 2^2556421249 is an apocalyptic number.

It is an amenable number.

2556421249 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556421249 is an equidigital number, since it uses as much as digits as its factorization.

2556421249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 40.

The square root of 2556421249 is about 50561.0645556440. The cubic root of 2556421249 is about 1367.3430040115.

The spelling of 2556421249 in words is "two billion, five hundred fifty-six million, four hundred twenty-one thousand, two hundred forty-nine".