243322861 has 2 divisors, whose sum is σ = 243322862. Its totient is φ = 243322860.

The previous prime is 243322843. The next prime is 243322897. The reversal of 243322861 is 168223342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237344836 + 5978025 = 15406^2 + 2445^2 .

It is a cyclic number.

It is not a de Polignac number, because 243322861 - 2⁵ = 243322829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243322831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121661430 + 121661431.

It is an arithmetic number, because the mean of its divisors is an integer number (121661431).

Almost surely, 2^243322861 is an apocalyptic number.

It is an amenable number.

243322861 is a deficient number, since it is larger than the sum of its proper divisors (1).

243322861 is an equidigital number, since it uses as much as digits as its factorization.

243322861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 243322861 is about 15598.8096020177. The cubic root of 243322861 is about 624.3013941307.

The spelling of 243322861 in words is "two hundred forty-three million, three hundred twenty-two thousand, eight hundred sixty-one".