243148481 has 4 divisors (see below), whose sum is σ = 244780500. Its totient is φ = 241516464.

The previous prime is 243148463. The next prime is 243148513. The reversal of 243148481 is 184841342.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103530625 + 139617856 = 10175^2 + 11816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243148481 is a prime.

It is a super-2 number, since 2×243148481² = 118242367625214722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243148981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815786 + ... + 816083.

It is an arithmetic number, because the mean of its divisors is an integer number (61195125).

Almost surely, 2^243148481 is an apocalyptic number.

It is an amenable number.

243148481 is a deficient number, since it is larger than the sum of its proper divisors (1632019).

243148481 is a wasteful number, since it uses less digits than its factorization.

243148481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632018.

The product of its digits is 24576, while the sum is 35.

The square root of 243148481 is about 15593.2190711219. The cubic root of 243148481 is about 624.1522210065.

The spelling of 243148481 in words is "two hundred forty-three million, one hundred forty-eight thousand, four hundred eighty-one".