243948551 has 32 divisors (see below), whose sum is σ = 317882880. Its totient is φ = 181641600.

The previous prime is 243948533. The next prime is 243948563. The reversal of 243948551 is 155849342.

It is not a de Polignac number, because 243948551 - 2¹⁰ = 243947527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243948499 and 243948508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243948251) 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 31 ways as a sum of consecutive naturals, for example, 238421 + ... + 239441.

It is an arithmetic number, because the mean of its divisors is an integer number (9933840).

Almost surely, 2^243948551 is an apocalyptic number.

243948551 is a deficient number, since it is larger than the sum of its proper divisors (73934329).

243948551 is a wasteful number, since it uses less digits than its factorization.

243948551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175.

The product of its digits is 172800, while the sum is 41.

The square root of 243948551 is about 15618.8524226334. The cubic root of 243948551 is about 624.8360538518.

The spelling of 243948551 in words is "two hundred forty-three million, nine hundred forty-eight thousand, five hundred fifty-one".