243421513 has 4 divisors (see below), whose sum is σ = 245033728. Its totient is φ = 241809300.

The previous prime is 243421511. The next prime is 243421531. The reversal of 243421513 is 315124342.

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 243421513 - 2¹ = 243421511 is a prime.

It is a super-6 number, since 6×243421513⁶ (a number of 52 digits) contains 666666 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243421511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805881 + ... + 806182.

It is an arithmetic number, because the mean of its divisors is an integer number (61258432).

Almost surely, 2^243421513 is an apocalyptic number.

It is an amenable number.

243421513 is a deficient number, since it is larger than the sum of its proper divisors (1612215).

243421513 is a wasteful number, since it uses less digits than its factorization.

243421513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612214.

The product of its digits is 2880, while the sum is 25.

The square root of 243421513 is about 15601.9714459423. The cubic root of 243421513 is about 624.3857542813.

Adding to 243421513 its reverse (315124342), we get a palindrome (558545855).

The spelling of 243421513 in words is "two hundred forty-three million, four hundred twenty-one thousand, five hundred thirteen".