242913661 has 4 divisors (see below), whose sum is σ = 242956800. Its totient is φ = 242870524.

The previous prime is 242913641. The next prime is 242913667. The reversal of 242913661 is 166319242.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 166319242 = 2 ⋅83159621.

It is a cyclic number.

It is not a de Polignac number, because 242913661 - 2¹⁹ = 242389373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242913667) 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, 11581 + ... + 24898.

It is an arithmetic number, because the mean of its divisors is an integer number (60739200).

Almost surely, 2^242913661 is an apocalyptic number.

It is an amenable number.

242913661 is a deficient number, since it is larger than the sum of its proper divisors (43139).

242913661 is an equidigital number, since it uses as much as digits as its factorization.

242913661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43138.

The product of its digits is 15552, while the sum is 34.

The square root of 242913661 is about 15585.6876973716. The cubic root of 242913661 is about 623.9512318409.

The spelling of 242913661 in words is "two hundred forty-two million, nine hundred thirteen thousand, six hundred sixty-one".