243861133 has 2 divisors, whose sum is σ = 243861134. Its totient is φ = 243861132.

The previous prime is 243861131. The next prime is 243861151. The reversal of 243861133 is 331168342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238300969 + 5560164 = 15437^2 + 2358^2 .

It is a cyclic number.

It is not a de Polignac number, because 243861133 - 2¹ = 243861131 is a prime.

Together with 243861131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 243861095 and 243861104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243861131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121930566 + 121930567.

It is an arithmetic number, because the mean of its divisors is an integer number (121930567).

Almost surely, 2^243861133 is an apocalyptic number.

It is an amenable number.

243861133 is a deficient number, since it is larger than the sum of its proper divisors (1).

243861133 is an equidigital number, since it uses as much as digits as its factorization.

243861133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 243861133 is about 15616.0536948360. The cubic root of 243861133 is about 624.7614090906.

The spelling of 243861133 in words is "two hundred forty-three million, eight hundred sixty-one thousand, one hundred thirty-three".