242919661 has 4 divisors (see below), whose sum is σ = 242964252. Its totient is φ = 242875072.

The previous prime is 242919653. The next prime is 242919667. The reversal of 242919661 is 166919242.

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 117614025 + 125305636 = 10845^2 + 11194^2 .

It is a cyclic number.

It is not a de Polignac number, because 242919661 - 2³ = 242919653 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242919667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12766 + ... + 25471.

It is an arithmetic number, because the mean of its divisors is an integer number (60741063).

Almost surely, 2^242919661 is an apocalyptic number.

It is an amenable number.

242919661 is a deficient number, since it is larger than the sum of its proper divisors (44591).

242919661 is an equidigital number, since it uses as much as digits as its factorization.

242919661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44590.

The product of its digits is 46656, while the sum is 40.

The square root of 242919661 is about 15585.8801804710. The cubic root of 242919661 is about 623.9563690250.

The spelling of 242919661 in words is "two hundred forty-two million, nine hundred nineteen thousand, six hundred sixty-one".