243120454061 has 2 divisors, whose sum is σ = 243120454062. Its totient is φ = 243120454060.

The previous prime is 243120454039. The next prime is 243120454063. The reversal of 243120454061 is 160454021342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238797391561 + 4323062500 = 488669^2 + 65750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243120454061 is a prime.

It is a super-2 number, since 2×243120454061² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 243120454063, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243120454063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560227030 + 121560227031.

It is an arithmetic number, because the mean of its divisors is an integer number (121560227031).

Almost surely, 2^243120454061 is an apocalyptic number.

It is an amenable number.

243120454061 is a deficient number, since it is larger than the sum of its proper divisors (1).

243120454061 is an equidigital number, since it uses as much as digits as its factorization.

243120454061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 243120454061 in words is "two hundred forty-three billion, one hundred twenty million, four hundred fifty-four thousand, sixty-one".