243680401 has 2 divisors, whose sum is σ = 243680402. Its totient is φ = 243680400.

The previous prime is 243680369. The next prime is 243680413. The reversal of 243680401 is 104086342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216796176 + 26884225 = 14724^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 243680401 - 2⁵ = 243680369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243680401.

It is not a weakly prime, because it can be changed into another prime (243680201) 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, 121840200 + 121840201.

It is an arithmetic number, because the mean of its divisors is an integer number (121840201).

Almost surely, 2^243680401 is an apocalyptic number.

It is an amenable number.

243680401 is a deficient number, since it is larger than the sum of its proper divisors (1).

243680401 is an equidigital number, since it uses as much as digits as its factorization.

243680401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 243680401 is about 15610.2658849874. The cubic root of 243680401 is about 624.6070284892.

The spelling of 243680401 in words is "two hundred forty-three million, six hundred eighty thousand, four hundred one".