203539029409 has 27 divisors (see below), whose sum is σ = 216032824371. Its totient is φ = 191758071120.

The previous prime is 203539029383. The next prime is 203539029497. The reversal of 203539029409 is 904920935302.

It is a happy number.

The square root of 203539029409 is 451153.

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., 106730929809 + 96808099600 = 326697^2 + 311140^2 .

It is not a de Polignac number, because 203539029409 - 2⁹ = 203539028897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203539026409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 614921374 + ... + 614921704.

Almost surely, 2^203539029409 is an apocalyptic number.

203539029409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

203539029409 is the 451153-rd square number.

203539029409 is the 225577-th centered octagonal number.

It is an amenable number.

203539029409 is a deficient number, since it is larger than the sum of its proper divisors (12493794962).

203539029409 is an frugal number, since it uses more digits than its factorization.

203539029409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 46.

The spelling of 203539029409 in words is "two hundred three billion, five hundred thirty-nine million, twenty-nine thousand, four hundred nine".