243320345501 has 4 divisors (see below), whose sum is σ = 243321776352. Its totient is φ = 243318914652.

The previous prime is 243320345417. The next prime is 243320345509. The reversal of 243320345501 is 105543023342.

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 not a de Polignac number, because 243320345501 - 2¹⁴ = 243320329117 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 (243320345509) 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, 419561 + ... + 814046.

It is an arithmetic number, because the mean of its divisors is an integer number (60830444088).

Almost surely, 2^243320345501 is an apocalyptic number.

It is an amenable number.

243320345501 is a deficient number, since it is larger than the sum of its proper divisors (1430851).

243320345501 is a wasteful number, since it uses less digits than its factorization.

243320345501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430850.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 243320345501 its reverse (105543023342), we get a palindrome (348863368843).

The spelling of 243320345501 in words is "two hundred forty-three billion, three hundred twenty million, three hundred forty-five thousand, five hundred one".