203213240309 has 2 divisors, whose sum is σ = 203213240310. Its totient is φ = 203213240308.

The previous prime is 203213240303. The next prime is 203213240317. The reversal of 203213240309 is 903042312302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199292602084 + 3920638225 = 446422^2 + 62615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203213240309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203213240303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101606620154 + 101606620155.

It is an arithmetic number, because the mean of its divisors is an integer number (101606620155).

Almost surely, 2^203213240309 is an apocalyptic number.

It is an amenable number.

203213240309 is a deficient number, since it is larger than the sum of its proper divisors (1).

203213240309 is an equidigital number, since it uses as much as digits as its factorization.

203213240309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The spelling of 203213240309 in words is "two hundred three billion, two hundred thirteen million, two hundred forty thousand, three hundred nine".