4242236561 has 2 divisors, whose sum is σ = 4242236562. Its totient is φ = 4242236560.

The previous prime is 4242236519. The next prime is 4242236567. The reversal of 4242236561 is 1656322424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3028410961 + 1213825600 = 55031^2 + 34840^2 .

It is a cyclic number.

It is not a de Polignac number, because 4242236561 - 2¹⁰ = 4242235537 is a prime.

It is not a weakly prime, because it can be changed into another prime (4242236567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121118280 + 2121118281.

It is an arithmetic number, because the mean of its divisors is an integer number (2121118281).

Almost surely, 2^4242236561 is an apocalyptic number.

It is an amenable number.

4242236561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4242236561 is an equidigital number, since it uses as much as digits as its factorization.

4242236561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 35.

The square root of 4242236561 is about 65132.4539764932. The cubic root of 4242236561 is about 1618.8190042368.

Adding to 4242236561 its reverse (1656322424), we get a palindrome (5898558985).

The spelling of 4242236561 in words is "four billion, two hundred forty-two million, two hundred thirty-six thousand, five hundred sixty-one".