243509619601 has 4 divisors (see below), whose sum is σ = 245143912500. Its totient is φ = 241875326704.

The previous prime is 243509619583. The next prime is 243509619631. The reversal of 243509619601 is 106916905342.

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 79593951376 + 163915668225 = 282124^2 + 404865^2 .

It is a cyclic number.

It is not a de Polignac number, because 243509619601 - 2⁵ = 243509619569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243509619631) 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, 817146226 + ... + 817146523.

It is an arithmetic number, because the mean of its divisors is an integer number (61285978125).

Almost surely, 2^243509619601 is an apocalyptic number.

It is an amenable number.

243509619601 is a deficient number, since it is larger than the sum of its proper divisors (1634292899).

243509619601 is a wasteful number, since it uses less digits than its factorization.

243509619601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634292898.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 243509619601 in words is "two hundred forty-three billion, five hundred nine million, six hundred nineteen thousand, six hundred one".