203945269609 has 9 divisors (see below), whose sum is σ = 206469993079. Its totient is φ = 201451066240.

The previous prime is 203945269519. The next prime is 203945269631. The reversal of 203945269609 is 906962549302.

The square root of 203945269609 is 451603.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 148381351209 + 55563918400 = 385203^2 + 235720^2 .

It is not a de Polignac number, because 203945269609 - 2⁷ = 203945269481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203945269609.

It is not an unprimeable number, because it can be changed into a prime (203945269309) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 37480329 + ... + 37485769.

Almost surely, 2^203945269609 is an apocalyptic number.

203945269609 is the 451603-rd square number.

203945269609 is the 225802-nd centered octagonal number.

It is an amenable number.

203945269609 is a deficient number, since it is larger than the sum of its proper divisors (2524723470).

203945269609 is an frugal number, since it uses more digits than its factorization.

203945269609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11048 (or 5524 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 55.

The spelling of 203945269609 in words is "two hundred three billion, nine hundred forty-five million, two hundred sixty-nine thousand, six hundred nine".