203909142969 has 27 divisors (see below), whose sum is σ = 342638780133. Its totient is φ = 116514091512.

The previous prime is 203909142923. The next prime is 203909142977. The reversal of 203909142969 is 969241909302.

The square root of 203909142969 is 451563.

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

203909142969 is a `hidden beast` number, since 20 + 390 + 9 + 142 + 96 + 9 = 666.

It is not a de Polignac number, because 203909142969 - 2¹⁷ = 203909011897 is a prime.

It is a super-2 number, since 2×203909142969² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203909142919) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9472072 + ... + 9493574.

Almost surely, 2^203909142969 is an apocalyptic number.

203909142969 is the 451563-rd square number.

203909142969 is the 225782-nd centered octagonal number.

It is an amenable number.

203909142969 is a deficient number, since it is larger than the sum of its proper divisors (138729637164).

203909142969 is an frugal number, since it uses more digits than its factorization.

203909142969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43026 (or 21513 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The spelling of 203909142969 in words is "two hundred three billion, nine hundred nine million, one hundred forty-two thousand, nine hundred sixty-nine".