243951601 has 4 divisors (see below), whose sum is σ = 245190132. Its totient is φ = 242713072.

The previous prime is 243951571. The next prime is 243951611. The reversal of 243951601 is 106159342.

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 183873600 + 60078001 = 13560^2 + 7751^2 .

It is a cyclic number.

It is not a de Polignac number, because 243951601 - 2¹³ = 243943409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243951611) 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, 618970 + ... + 619363.

It is an arithmetic number, because the mean of its divisors is an integer number (61297533).

Almost surely, 2^243951601 is an apocalyptic number.

It is an amenable number.

243951601 is a deficient number, since it is larger than the sum of its proper divisors (1238531).

243951601 is a wasteful number, since it uses less digits than its factorization.

243951601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238530.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 243951601 is about 15618.9500607435. The cubic root of 243951601 is about 624.8386578735.

The spelling of 243951601 in words is "two hundred forty-three million, nine hundred fifty-one thousand, six hundred one".