2521427809 has 2 divisors, whose sum is σ = 2521427810. Its totient is φ = 2521427808.

The previous prime is 2521427803. The next prime is 2521427897. The reversal of 2521427809 is 9087241252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1652829025 + 868598784 = 40655^2 + 29472^2 .

It is a cyclic number.

It is not a de Polignac number, because 2521427809 - 2⁷ = 2521427681 is a prime.

It is not a weakly prime, because it can be changed into another prime (2521427803) 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, 1260713904 + 1260713905.

It is an arithmetic number, because the mean of its divisors is an integer number (1260713905).

Almost surely, 2^2521427809 is an apocalyptic number.

It is an amenable number.

2521427809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521427809 is an equidigital number, since it uses as much as digits as its factorization.

2521427809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 2521427809 is about 50213.8208962433. The cubic root of 2521427809 is about 1361.0753837657.

The spelling of 2521427809 in words is "two billion, five hundred twenty-one million, four hundred twenty-seven thousand, eight hundred nine".