2528491561 has 2 divisors, whose sum is σ = 2528491562. Its totient is φ = 2528491560.

The previous prime is 2528491543. The next prime is 2528491577. The reversal of 2528491561 is 1651948252.

2528491561 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., 2496501225 + 31990336 = 49965^2 + 5656^2 .

It is a cyclic number.

It is not a de Polignac number, because 2528491561 - 2¹³ = 2528483369 is a prime.

It is not a weakly prime, because it can be changed into another prime (2528491261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1264245780 + 1264245781.

It is an arithmetic number, because the mean of its divisors is an integer number (1264245781).

Almost surely, 2^2528491561 is an apocalyptic number.

It is an amenable number.

2528491561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2528491561 is an equidigital number, since it uses as much as digits as its factorization.

2528491561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 43.

The square root of 2528491561 is about 50284.1084339774. The cubic root of 2528491561 is about 1362.3452112236.

The spelling of 2528491561 in words is "two billion, five hundred twenty-eight million, four hundred ninety-one thousand, five hundred sixty-one".