242720609 has 4 divisors (see below), whose sum is σ = 242756400. Its totient is φ = 242684820.

The previous prime is 242720603. The next prime is 242720617. The reversal of 242720609 is 906027242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 242720609 - 2⁸ = 242720353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (242720603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4259 + ... + 22440.

It is an arithmetic number, because the mean of its divisors is an integer number (60689100).

Almost surely, 2^242720609 is an apocalyptic number.

It is an amenable number.

242720609 is a deficient number, since it is larger than the sum of its proper divisors (35791).

242720609 is an equidigital number, since it uses as much as digits as its factorization.

242720609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35790.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 242720609 is about 15579.4932202559. The cubic root of 242720609 is about 623.7858960631.

The spelling of 242720609 in words is "two hundred forty-two million, seven hundred twenty thousand, six hundred nine".