243551403 has 6 divisors (see below), whose sum is σ = 351796484. Its totient is φ = 162367596.

The previous prime is 243551359. The next prime is 243551423. The reversal of 243551403 is 304155342.

It is not a de Polignac number, because 243551403 - 2¹⁶ = 243485867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243551423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13530625 + ... + 13530642.

Almost surely, 2^243551403 is an apocalyptic number.

243551403 is a deficient number, since it is larger than the sum of its proper divisors (108245081).

243551403 is a wasteful number, since it uses less digits than its factorization.

243551403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27061273 (or 27061270 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 243551403 is about 15606.1335057727. The cubic root of 243551403 is about 624.4967921864.

The spelling of 243551403 in words is "two hundred forty-three million, five hundred fifty-one thousand, four hundred three".