243081197 has 2 divisors, whose sum is σ = 243081198. Its totient is φ = 243081196.

The previous prime is 243081191. The next prime is 243081233. The reversal of 243081197 is 791180342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183575401 + 59505796 = 13549^2 + 7714^2 .

It is a cyclic number.

It is not a de Polignac number, because 243081197 - 2⁸ = 243080941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243081191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121540598 + 121540599.

It is an arithmetic number, because the mean of its divisors is an integer number (121540599).

Almost surely, 2^243081197 is an apocalyptic number.

It is an amenable number.

243081197 is a deficient number, since it is larger than the sum of its proper divisors (1).

243081197 is an equidigital number, since it uses as much as digits as its factorization.

243081197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 243081197 is about 15591.0614455848. The cubic root of 243081197 is about 624.0946439352.

The spelling of 243081197 in words is "two hundred forty-three million, eighty-one thousand, one hundred ninety-seven".