2520642409 has 2 divisors, whose sum is σ = 2520642410. Its totient is φ = 2520642408.

The previous prime is 2520642373. The next prime is 2520642437. The reversal of 2520642409 is 9042460252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1725571600 + 795070809 = 41540^2 + 28197^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520642409 - 2¹⁹ = 2520118121 is a prime.

It is not a weakly prime, because it can be changed into another prime (2520642109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260321204 + 1260321205.

It is an arithmetic number, because the mean of its divisors is an integer number (1260321205).

Almost surely, 2^2520642409 is an apocalyptic number.

It is an amenable number.

2520642409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520642409 is an equidigital number, since it uses as much as digits as its factorization.

2520642409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 2520642409 is about 50205.9997311078. Note that the first 3 decimals coincide. The cubic root of 2520642409 is about 1360.9340485515.

The spelling of 2520642409 in words is "two billion, five hundred twenty million, six hundred forty-two thousand, four hundred nine".