2529520781 has 2 divisors, whose sum is σ = 2529520782. Its totient is φ = 2529520780.

The previous prime is 2529520769. The next prime is 2529520783. The reversal of 2529520781 is 1870259252.

2529520781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1357554025 + 1171966756 = 36845^2 + 34234^2 .

It is a cyclic number.

It is not a de Polignac number, because 2529520781 - 2²² = 2525326477 is a prime.

It is a super-2 number, since 2×2529520781² = 12796950763021699922, which contains 22 as substring.

Together with 2529520783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2529520783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1264760390 + 1264760391.

It is an arithmetic number, because the mean of its divisors is an integer number (1264760391).

Almost surely, 2^2529520781 is an apocalyptic number.

It is an amenable number.

2529520781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2529520781 is an equidigital number, since it uses as much as digits as its factorization.

2529520781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 2529520781 is about 50294.3414411602. The cubic root of 2529520781 is about 1362.5300332409.

The spelling of 2529520781 in words is "two billion, five hundred twenty-nine million, five hundred twenty thousand, seven hundred eighty-one".