243461261 has 2 divisors, whose sum is σ = 243461262. Its totient is φ = 243461260.

The previous prime is 243461243. The next prime is 243461263. The reversal of 243461261 is 162164342.

243461261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173738761 + 69722500 = 13181^2 + 8350^2 .

It is a cyclic number.

It is not a de Polignac number, because 243461261 - 2¹⁰ = 243460237 is a prime.

Together with 243461263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243461263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121730630 + 121730631.

It is an arithmetic number, because the mean of its divisors is an integer number (121730631).

Almost surely, 2^243461261 is an apocalyptic number.

It is an amenable number.

243461261 is a deficient number, since it is larger than the sum of its proper divisors (1).

243461261 is an equidigital number, since it uses as much as digits as its factorization.

243461261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 243461261 is about 15603.2452073279. The cubic root of 243461261 is about 624.4197374927.

The spelling of 243461261 in words is "two hundred forty-three million, four hundred sixty-one thousand, two hundred sixty-one".