243311401 has 2 divisors, whose sum is σ = 243311402. Its totient is φ = 243311400.

The previous prime is 243311357. The next prime is 243311407. The reversal of 243311401 is 104113342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241491600 + 1819801 = 15540^2 + 1349^2 .

It is a cyclic number.

It is not a de Polignac number, because 243311401 - 2¹³ = 243303209 is a prime.

It is not a weakly prime, because it can be changed into another prime (243311407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121655700 + 121655701.

It is an arithmetic number, because the mean of its divisors is an integer number (121655701).

Almost surely, 2^243311401 is an apocalyptic number.

It is an amenable number.

243311401 is a deficient number, since it is larger than the sum of its proper divisors (1).

243311401 is an equidigital number, since it uses as much as digits as its factorization.

243311401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 243311401 is about 15598.4422619696. The cubic root of 243311401 is about 624.2915928783.

Adding to 243311401 its reverse (104113342), we get a palindrome (347424743).

The spelling of 243311401 in words is "two hundred forty-three million, three hundred eleven thousand, four hundred one".