243953 has 2 divisors, whose sum is σ = 243954. Its totient is φ = 243952.

The previous prime is 243931. The next prime is 243973. The reversal of 243953 is 359342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214369 + 29584 = 463^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 243953 - 2⁶ = 243889 is a prime.

It is not a weakly prime, because it can be changed into another prime (243973) 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, 121976 + 121977.

It is an arithmetic number, because the mean of its divisors is an integer number (121977).

2²⁴³⁹⁵³ is an apocalyptic number.

It is an amenable number.

243953 is a deficient number, since it is larger than the sum of its proper divisors (1).

243953 is an equidigital number, since it uses as much as digits as its factorization.

243953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 26.

The square root of 243953 is about 493.9159847585. The cubic root of 243953 is about 62.4839852301.

The spelling of 243953 in words is "two hundred forty-three thousand, nine hundred fifty-three".