2043215509 has 2 divisors, whose sum is σ = 2043215510. Its totient is φ = 2043215508.

The previous prime is 2043215507. The next prime is 2043215519. The reversal of 2043215509 is 9055123402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2016279409 + 26936100 = 44903^2 + 5190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2043215509 - 2¹ = 2043215507 is a prime.

Together with 2043215507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2043215507) 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, 1021607754 + 1021607755.

It is an arithmetic number, because the mean of its divisors is an integer number (1021607755).

Almost surely, 2^2043215509 is an apocalyptic number.

It is an amenable number.

2043215509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2043215509 is an equidigital number, since it uses as much as digits as its factorization.

2043215509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 2043215509 is about 45201.9414295448. The cubic root of 2043215509 is about 1268.9311504179.

The spelling of 2043215509 in words is "two billion, forty-three million, two hundred fifteen thousand, five hundred nine".