243401201273 has 2 divisors, whose sum is σ = 243401201274. Its totient is φ = 243401201272.

The previous prime is 243401201237. The next prime is 243401201287. The reversal of 243401201273 is 372102104342.

Together with previous prime (243401201237) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243401129449 + 71824 = 493357^2 + 268^2 .

It is a cyclic number.

It is not a de Polignac number, because 243401201273 - 2¹⁶ = 243401135737 is a prime.

It is a super-2 number, since 2×243401201273² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243401201473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121700600636 + 121700600637.

It is an arithmetic number, because the mean of its divisors is an integer number (121700600637).

Almost surely, 2^243401201273 is an apocalyptic number.

It is an amenable number.

243401201273 is a deficient number, since it is larger than the sum of its proper divisors (1).

243401201273 is an equidigital number, since it uses as much as digits as its factorization.

243401201273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 29.

The spelling of 243401201273 in words is "two hundred forty-three billion, four hundred one million, two hundred one thousand, two hundred seventy-three".