242943661 has 2 divisors, whose sum is σ = 242943662. Its totient is φ = 242943660.

The previous prime is 242943619. The next prime is 242943667. The reversal of 242943661 is 166349242.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216266436 + 26677225 = 14706^2 + 5165^2 .

It is a cyclic number.

It is not a de Polignac number, because 242943661 - 2¹⁵ = 242910893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 242943661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242943667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121471830 + 121471831.

It is an arithmetic number, because the mean of its divisors is an integer number (121471831).

Almost surely, 2^242943661 is an apocalyptic number.

It is an amenable number.

242943661 is a deficient number, since it is larger than the sum of its proper divisors (1).

242943661 is an equidigital number, since it uses as much as digits as its factorization.

242943661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 242943661 is about 15586.6500890987. The cubic root of 242943661 is about 623.9769169154.

The spelling of 242943661 in words is "two hundred forty-two million, nine hundred forty-three thousand, six hundred sixty-one".