203945269309 has 2 divisors, whose sum is σ = 203945269310. Its totient is φ = 203945269308.

The previous prime is 203945269259. The next prime is 203945269321. The reversal of 203945269309 is 903962549302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200298317209 + 3646952100 = 447547^2 + 60390^2 .

It is a cyclic number.

It is not a de Polignac number, because 203945269309 - 2²¹ = 203943172157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203945269709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101972634654 + 101972634655.

It is an arithmetic number, because the mean of its divisors is an integer number (101972634655).

Almost surely, 2^203945269309 is an apocalyptic number.

It is an amenable number.

203945269309 is a deficient number, since it is larger than the sum of its proper divisors (1).

203945269309 is an equidigital number, since it uses as much as digits as its factorization.

203945269309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3149280, while the sum is 52.

The spelling of 203945269309 in words is "two hundred three billion, nine hundred forty-five million, two hundred sixty-nine thousand, three hundred nine".