243978233 has 2 divisors, whose sum is σ = 243978234. Its totient is φ = 243978232.

The previous prime is 243978211. The next prime is 243978283. The reversal of 243978233 is 332879342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231283264 + 12694969 = 15208^2 + 3563^2 .

It is a cyclic number.

It is not a de Polignac number, because 243978233 - 2⁸ = 243977977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243978283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121989116 + 121989117.

It is an arithmetic number, because the mean of its divisors is an integer number (121989117).

Almost surely, 2^243978233 is an apocalyptic number.

It is an amenable number.

243978233 is a deficient number, since it is larger than the sum of its proper divisors (1).

243978233 is an equidigital number, since it uses as much as digits as its factorization.

243978233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 41.

The square root of 243978233 is about 15619.8025915823. The cubic root of 243978233 is about 624.8613947573.

The spelling of 243978233 in words is "two hundred forty-three million, nine hundred seventy-eight thousand, two hundred thirty-three".