243120180913 has 2 divisors, whose sum is σ = 243120180914. Its totient is φ = 243120180912.

The previous prime is 243120180859. The next prime is 243120180917. The reversal of 243120180913 is 319081021342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239696409744 + 3423771169 = 489588^2 + 58513^2 .

It is a cyclic number.

It is not a de Polignac number, because 243120180913 - 2¹³ = 243120172721 is a prime.

It is not a weakly prime, because it can be changed into another prime (243120180917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560090456 + 121560090457.

It is an arithmetic number, because the mean of its divisors is an integer number (121560090457).

Almost surely, 2^243120180913 is an apocalyptic number.

It is an amenable number.

243120180913 is a deficient number, since it is larger than the sum of its proper divisors (1).

243120180913 is an equidigital number, since it uses as much as digits as its factorization.

243120180913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 243120180913 in words is "two hundred forty-three billion, one hundred twenty million, one hundred eighty thousand, nine hundred thirteen".