243110545409 has 2 divisors, whose sum is σ = 243110545410. Its totient is φ = 243110545408.

The previous prime is 243110545361. The next prime is 243110545411. The reversal of 243110545409 is 904545011342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165448003009 + 77662542400 = 406753^2 + 278680^2 .

It is a cyclic number.

It is not a de Polignac number, because 243110545409 - 2¹² = 243110541313 is a prime.

It is a super-2 number, since 2×243110545409² (a number of 24 digits) contains 22 as substring.

Together with 243110545411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243110547409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121555272704 + 121555272705.

It is an arithmetic number, because the mean of its divisors is an integer number (121555272705).

Almost surely, 2^243110545409 is an apocalyptic number.

It is an amenable number.

243110545409 is a deficient number, since it is larger than the sum of its proper divisors (1).

243110545409 is an equidigital number, since it uses as much as digits as its factorization.

243110545409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 243110545409 in words is "two hundred forty-three billion, one hundred ten million, five hundred forty-five thousand, four hundred nine".