2520381209 has 2 divisors, whose sum is σ = 2520381210. Its totient is φ = 2520381208.

The previous prime is 2520381139. The next prime is 2520381289. The reversal of 2520381209 is 9021830252.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2520341209 + 40000 = 50203^2 + 200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2520381209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2520381289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260190604 + 1260190605.

It is an arithmetic number, because the mean of its divisors is an integer number (1260190605).

Almost surely, 2^2520381209 is an apocalyptic number.

It is an amenable number.

2520381209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520381209 is an equidigital number, since it uses as much as digits as its factorization.

2520381209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 2520381209 is about 50203.3983809861. The cubic root of 2520381209 is about 1360.8870382799.

The spelling of 2520381209 in words is "two billion, five hundred twenty million, three hundred eighty-one thousand, two hundred nine".