243125553 has 32 divisors (see below), whose sum is σ = 360364032. Its totient is φ = 144576000.

The previous prime is 243125471. The next prime is 243125563. The reversal of 243125553 is 355521342.

It is not a de Polignac number, because 243125553 - 2¹² = 243121457 is a prime.

It is a super-2 number, since 2×243125553² = 118220069043111618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 243125553.

It is not an unprimeable number, because it can be changed into a prime (243125563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 483100 + ... + 483602.

It is an arithmetic number, because the mean of its divisors is an integer number (11261376).

Almost surely, 2^243125553 is an apocalyptic number.

It is an amenable number.

243125553 is a deficient number, since it is larger than the sum of its proper divisors (117238479).

243125553 is a wasteful number, since it uses less digits than its factorization.

243125553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765.

The product of its digits is 18000, while the sum is 30.

The square root of 243125553 is about 15592.4838624255. The cubic root of 243125553 is about 624.1326019766.

Adding to 243125553 its reverse (355521342), we get a palindrome (598646895).

The spelling of 243125553 in words is "two hundred forty-three million, one hundred twenty-five thousand, five hundred fifty-three".