242659561 has 2 divisors, whose sum is σ = 242659562. Its totient is φ = 242659560.

The previous prime is 242659523. The next prime is 242659577. The reversal of 242659561 is 165956242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213715161 + 28944400 = 14619^2 + 5380^2 .

It is a cyclic number.

It is not a de Polignac number, because 242659561 - 2⁷ = 242659433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242659511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121329780 + 121329781.

It is an arithmetic number, because the mean of its divisors is an integer number (121329781).

Almost surely, 2^242659561 is an apocalyptic number.

It is an amenable number.

242659561 is a deficient number, since it is larger than the sum of its proper divisors (1).

242659561 is an equidigital number, since it uses as much as digits as its factorization.

242659561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The square root of 242659561 is about 15577.5338548822. The cubic root of 242659561 is about 623.7335944001.

The spelling of 242659561 in words is "two hundred forty-two million, six hundred fifty-nine thousand, five hundred sixty-one".