243103021309 has 2 divisors, whose sum is σ = 243103021310. Its totient is φ = 243103021308.

The previous prime is 243103021289. The next prime is 243103021319. The reversal of 243103021309 is 903120301342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240513738084 + 2589283225 = 490422^2 + 50885^2 .

It is a cyclic number.

It is not a de Polignac number, because 243103021309 - 2⁵ = 243103021277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243103021319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121551510654 + 121551510655.

It is an arithmetic number, because the mean of its divisors is an integer number (121551510655).

Almost surely, 2^243103021309 is an apocalyptic number.

It is an amenable number.

243103021309 is a deficient number, since it is larger than the sum of its proper divisors (1).

243103021309 is an equidigital number, since it uses as much as digits as its factorization.

243103021309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 243103021309 in words is "two hundred forty-three billion, one hundred three million, twenty-one thousand, three hundred nine".