243228311 has 2 divisors, whose sum is σ = 243228312. Its totient is φ = 243228310.

The previous prime is 243228259. The next prime is 243228317. The reversal of 243228311 is 113822342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243228311 - 2²² = 239034007 is a prime.

It is a super-2 number, since 2×243228311² = 118320022543825442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243228317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121614155 + 121614156.

It is an arithmetic number, because the mean of its divisors is an integer number (121614156).

Almost surely, 2^243228311 is an apocalyptic number.

243228311 is a deficient number, since it is larger than the sum of its proper divisors (1).

243228311 is an equidigital number, since it uses as much as digits as its factorization.

243228311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 243228311 is about 15595.7786275646. The cubic root of 243228311 is about 624.2205203157.

The spelling of 243228311 in words is "two hundred forty-three million, two hundred twenty-eight thousand, three hundred eleven".