243944124649 has 9 divisors (see below), whose sum is σ = 248660370903. Its totient is φ = 239315722152.

The previous prime is 243944124631. The next prime is 243944124709. The reversal of 243944124649 is 946421449342.

The square root of 243944124649 is 493907.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 175858616025 + 68085508624 = 419355^2 + 260932^2 .

It is not a de Polignac number, because 243944124649 - 2³⁵ = 209584386281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243944124596 and 243944124605.

It is not an unprimeable number, because it can be changed into a prime (243944124629) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26172412 + ... + 26181730.

Almost surely, 2^243944124649 is an apocalyptic number.

243944124649 is the 493907-th square number.

243944124649 is the 246954-th centered octagonal number.

It is an amenable number.

243944124649 is a deficient number, since it is larger than the sum of its proper divisors (4716246254).

243944124649 is an frugal number, since it uses more digits than its factorization.

243944124649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18744 (or 9372 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 52.

The spelling of 243944124649 in words is "two hundred forty-three billion, nine hundred forty-four million, one hundred twenty-four thousand, six hundred forty-nine".