2135456509 has 2 divisors, whose sum is σ = 2135456510. Its totient is φ = 2135456508.

The previous prime is 2135456507. The next prime is 2135456537. The reversal of 2135456509 is 9056545312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2108187225 + 27269284 = 45915^2 + 5222^2 .

It is a cyclic number.

It is not a de Polignac number, because 2135456509 - 2¹ = 2135456507 is a prime.

Together with 2135456507, 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 (2135456501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1067728254 + 1067728255.

It is an arithmetic number, because the mean of its divisors is an integer number (1067728255).

Almost surely, 2^2135456509 is an apocalyptic number.

It is an amenable number.

2135456509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2135456509 is an equidigital number, since it uses as much as digits as its factorization.

2135456509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 2135456509 is about 46210.9998701608. Note that the first 3 decimals coincide. The cubic root of 2135456509 is about 1287.7461011191.

The spelling of 2135456509 in words is "two billion, one hundred thirty-five million, four hundred fifty-six thousand, five hundred nine".