243954961 has 8 divisors (see below), whose sum is σ = 250987464. Its totient is φ = 236974080.

The previous prime is 243954943. The next prime is 243955001. The reversal of 243954961 is 169459342.

It can be written as a sum of positive squares in 4 ways, for example, as 14250625 + 229704336 = 3775^2 + 15156^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243954961 - 2⁵ = 243954929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243934961) 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 7 ways as a sum of consecutive naturals, for example, 3216 + ... + 22321.

It is an arithmetic number, because the mean of its divisors is an integer number (31373433).

Almost surely, 2^243954961 is an apocalyptic number.

It is an amenable number.

243954961 is a deficient number, since it is larger than the sum of its proper divisors (7032503).

243954961 is a wasteful number, since it uses less digits than its factorization.

243954961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25811.

The product of its digits is 233280, while the sum is 43.

The square root of 243954961 is about 15619.0576220206. The cubic root of 243954961 is about 624.8415265413.

The spelling of 243954961 in words is "two hundred forty-three million, nine hundred fifty-four thousand, nine hundred sixty-one".