243200261 has 2 divisors, whose sum is σ = 243200262. Its totient is φ = 243200260.

The previous prime is 243200219. The next prime is 243200267. The reversal of 243200261 is 162002342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236975236 + 6225025 = 15394^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 243200261 - 2²² = 239005957 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 (243200267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121600130 + 121600131.

It is an arithmetic number, because the mean of its divisors is an integer number (121600131).

Almost surely, 2^243200261 is an apocalyptic number.

It is an amenable number.

243200261 is a deficient number, since it is larger than the sum of its proper divisors (1).

243200261 is an equidigital number, since it uses as much as digits as its factorization.

243200261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 243200261 is about 15594.8793198280. The cubic root of 243200261 is about 624.1965235770.

The spelling of 243200261 in words is "two hundred forty-three million, two hundred thousand, two hundred sixty-one".