2520080309 has 4 divisors (see below), whose sum is σ = 2606979660. Its totient is φ = 2433180960.

The previous prime is 2520080209. The next prime is 2520080341. The reversal of 2520080309 is 9030800252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 907816900 + 1612263409 = 30130^2 + 40153^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520080309 - 2⁸ = 2520080053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 86899321 = 2520080309 / (2 + 5 + 2 + 0 + 0 + 8 + 0 + 3 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2520080209) 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 in 3 ways as a sum of consecutive naturals, for example, 43449632 + ... + 43449689.

It is an arithmetic number, because the mean of its divisors is an integer number (651744915).

Almost surely, 2^2520080309 is an apocalyptic number.

2520080309 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2520080309 is a deficient number, since it is larger than the sum of its proper divisors (86899351).

2520080309 is an equidigital number, since it uses as much as digits as its factorization.

2520080309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86899350.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 2520080309 is about 50200.4014824583. The cubic root of 2520080309 is about 1360.8328788528.

The spelling of 2520080309 in words is "two billion, five hundred twenty million, eighty thousand, three hundred nine".