243267197 has 2 divisors, whose sum is σ = 243267198. Its totient is φ = 243267196.

The previous prime is 243267187. The next prime is 243267221. The reversal of 243267197 is 791762342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 229643716 + 13623481 = 15154^2 + 3691^2 .

It is a cyclic number.

It is not a de Polignac number, because 243267197 - 2⁶ = 243267133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243267187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121633598 + 121633599.

It is an arithmetic number, because the mean of its divisors is an integer number (121633599).

Almost surely, 2^243267197 is an apocalyptic number.

It is an amenable number.

243267197 is a deficient number, since it is larger than the sum of its proper divisors (1).

243267197 is an equidigital number, since it uses as much as digits as its factorization.

243267197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 243267197 is about 15597.0252612477. The cubic root of 243267197 is about 624.2537841870.

The spelling of 243267197 in words is "two hundred forty-three million, two hundred sixty-seven thousand, one hundred ninety-seven".