234143561 has 2 divisors, whose sum is σ = 234143562. Its totient is φ = 234143560.

The previous prime is 234143551. The next prime is 234143629. The reversal of 234143561 is 165341432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229219600 + 4923961 = 15140^2 + 2219^2 .

It is a cyclic number.

It is not a de Polignac number, because 234143561 - 2¹⁰ = 234142537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (234143551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117071780 + 117071781.

It is an arithmetic number, because the mean of its divisors is an integer number (117071781).

Almost surely, 2^234143561 is an apocalyptic number.

It is an amenable number.

234143561 is a deficient number, since it is larger than the sum of its proper divisors (1).

234143561 is an equidigital number, since it uses as much as digits as its factorization.

234143561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 234143561 is about 15301.7502593658. The cubic root of 234143561 is about 616.3500085790.

Adding to 234143561 its reverse (165341432), we get a palindrome (399484993).

The spelling of 234143561 in words is "two hundred thirty-four million, one hundred forty-three thousand, five hundred sixty-one".