243643061 has 4 divisors (see below), whose sum is σ = 256466400. Its totient is φ = 230819724.

The previous prime is 243643051. The next prime is 243643069. The reversal of 243643061 is 160346342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243643061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243643069) 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, 6411641 + ... + 6411678.

It is an arithmetic number, because the mean of its divisors is an integer number (64116600).

Almost surely, 2^243643061 is an apocalyptic number.

It is an amenable number.

243643061 is a deficient number, since it is larger than the sum of its proper divisors (12823339).

243643061 is a wasteful number, since it uses less digits than its factorization.

243643061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12823338.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 243643061 is about 15609.0698313513. The cubic root of 243643061 is about 624.5751232864.

The spelling of 243643061 in words is "two hundred forty-three million, six hundred forty-three thousand, sixty-one".