243311197 has 2 divisors, whose sum is σ = 243311198. Its totient is φ = 243311196.

The previous prime is 243311171. The next prime is 243311213. The reversal of 243311197 is 791113342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214944921 + 28366276 = 14661^2 + 5326^2 .

It is a cyclic number.

It is not a de Polignac number, because 243311197 - 2⁷ = 243311069 is a 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 (243311597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121655598 + 121655599.

It is an arithmetic number, because the mean of its divisors is an integer number (121655599).

Almost surely, 2^243311197 is an apocalyptic number.

It is an amenable number.

243311197 is a deficient number, since it is larger than the sum of its proper divisors (1).

243311197 is an equidigital number, since it uses as much as digits as its factorization.

243311197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 243311197 is about 15598.4357228538. The cubic root of 243311197 is about 624.2914184030.

The spelling of 243311197 in words is "two hundred forty-three million, three hundred eleven thousand, one hundred ninety-seven".