242311561 has 2 divisors, whose sum is σ = 242311562. Its totient is φ = 242311560.

The previous prime is 242311549. The next prime is 242311571. The reversal of 242311561 is 165113242.

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., 129527161 + 112784400 = 11381^2 + 10620^2 .

It is a cyclic number.

It is not a de Polignac number, because 242311561 - 2¹⁷ = 242180489 is a prime.

It is not a weakly prime, because it can be changed into another prime (242311571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121155780 + 121155781.

It is an arithmetic number, because the mean of its divisors is an integer number (121155781).

Almost surely, 2^242311561 is an apocalyptic number.

It is an amenable number.

242311561 is a deficient number, since it is larger than the sum of its proper divisors (1).

242311561 is an equidigital number, since it uses as much as digits as its factorization.

242311561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 242311561 is about 15566.3599148934. The cubic root of 242311561 is about 623.4352846545.

The spelling of 242311561 in words is "two hundred forty-two million, three hundred eleven thousand, five hundred sixty-one".