2520576781 has 2 divisors, whose sum is σ = 2520576782. Its totient is φ = 2520576780.

The previous prime is 2520576763. The next prime is 2520576787. The reversal of 2520576781 is 1876750252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1356743556 + 1163833225 = 36834^2 + 34115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520576781 - 2⁵ = 2520576749 is a prime.

It is a super-2 number, since 2×2520576781² = 12706614617832643922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2520576787) 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, 1260288390 + 1260288391.

It is an arithmetic number, because the mean of its divisors is an integer number (1260288391).

Almost surely, 2^2520576781 is an apocalyptic number.

It is an amenable number.

2520576781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520576781 is an equidigital number, since it uses as much as digits as its factorization.

2520576781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 2520576781 is about 50205.3461396294. The cubic root of 2520576781 is about 1360.9222372563.

The spelling of 2520576781 in words is "two billion, five hundred twenty million, five hundred seventy-six thousand, seven hundred eighty-one".