243415189 has 2 divisors, whose sum is σ = 243415190. Its totient is φ = 243415188.

The previous prime is 243415177. The next prime is 243415199. The reversal of 243415189 is 981514342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218744100 + 24671089 = 14790^2 + 4967^2 .

It is a cyclic number.

It is not a de Polignac number, because 243415189 - 2⁵ = 243415157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243415169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121707594 + 121707595.

It is an arithmetic number, because the mean of its divisors is an integer number (121707595).

Almost surely, 2^243415189 is an apocalyptic number.

It is an amenable number.

243415189 is a deficient number, since it is larger than the sum of its proper divisors (1).

243415189 is an equidigital number, since it uses as much as digits as its factorization.

243415189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 243415189 is about 15601.7687779303. The cubic root of 243415189 is about 624.3803471315.

The spelling of 243415189 in words is "two hundred forty-three million, four hundred fifteen thousand, one hundred eighty-nine".