243189441 has 12 divisors (see below), whose sum is σ = 383207760. Its totient is φ = 147387480.

The previous prime is 243189433. The next prime is 243189449. The reversal of 243189441 is 144981342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243189433) and next prime (243189449).

It is not a de Polignac number, because 243189441 - 2³ = 243189433 is a prime.

It is a super-2 number, since 2×243189441² = 118282208427784962, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243189396 and 243189405.

It is not an unprimeable number, because it can be changed into a prime (243189449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1228131 + ... + 1228328.

It is an arithmetic number, because the mean of its divisors is an integer number (31933980).

Almost surely, 2^243189441 is an apocalyptic number.

It is an amenable number.

243189441 is a deficient number, since it is larger than the sum of its proper divisors (140018319).

243189441 is a wasteful number, since it uses less digits than its factorization.

243189441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456476 (or 2456473 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 243189441 is about 15594.5324072253. The cubic root of 243189441 is about 624.1872665878.

The spelling of 243189441 in words is "two hundred forty-three million, one hundred eighty-nine thousand, four hundred forty-one".