243120138187 has 2 divisors, whose sum is σ = 243120138188. Its totient is φ = 243120138186.

The previous prime is 243120138167. The next prime is 243120138203. The reversal of 243120138187 is 781831021342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243120138187 - 2¹¹ = 243120136139 is a prime.

It is not a weakly prime, because it can be changed into another prime (243120138167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560069093 + 121560069094.

It is an arithmetic number, because the mean of its divisors is an integer number (121560069094).

Almost surely, 2^243120138187 is an apocalyptic number.

243120138187 is a deficient number, since it is larger than the sum of its proper divisors (1).

243120138187 is an equidigital number, since it uses as much as digits as its factorization.

243120138187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 243120138187 in words is "two hundred forty-three billion, one hundred twenty million, one hundred thirty-eight thousand, one hundred eighty-seven".