242643305 has 4 divisors (see below), whose sum is σ = 291171972. Its totient is φ = 194114640.

The previous prime is 242643301. The next prime is 242643337. The reversal of 242643305 is 503346242.

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 169728784 + 72914521 = 13028^2 + 8539^2 .

It is not a de Polignac number, because 242643305 - 2² = 242643301 is a prime.

It is a super-2 number, since 2×242643305² = 117751546922646050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242643301) 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, 24264326 + ... + 24264335.

It is an arithmetic number, because the mean of its divisors is an integer number (72792993).

Almost surely, 2^242643305 is an apocalyptic number.

It is an amenable number.

242643305 is a deficient number, since it is larger than the sum of its proper divisors (48528667).

242643305 is an equidigital number, since it uses as much as digits as its factorization.

242643305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48528666.

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 242643305 is about 15577.0120690715. The cubic root of 242643305 is about 623.7196659157.

Adding to 242643305 its reverse (503346242), we get a palindrome (745989547).

The spelling of 242643305 in words is "two hundred forty-two million, six hundred forty-three thousand, three hundred five".