240212509 has 2 divisors, whose sum is σ = 240212510. Its totient is φ = 240212508.

The previous prime is 240212501. The next prime is 240212519. The reversal of 240212509 is 905212042.

240212509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127916100 + 112296409 = 11310^2 + 10597^2 .

It is a cyclic number.

It is not a de Polignac number, because 240212509 - 2³ = 240212501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240212501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120106254 + 120106255.

It is an arithmetic number, because the mean of its divisors is an integer number (120106255).

Almost surely, 2^240212509 is an apocalyptic number.

It is an amenable number.

240212509 is a deficient number, since it is larger than the sum of its proper divisors (1).

240212509 is an equidigital number, since it uses as much as digits as its factorization.

240212509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 240212509 is about 15498.7905657183. The cubic root of 240212509 is about 621.6298678784.

The spelling of 240212509 in words is "two hundred forty million, two hundred twelve thousand, five hundred nine".