243134312521 has 8 divisors (see below), whose sum is σ = 246316194504. Its totient is φ = 239967619200.

The previous prime is 243134312483. The next prime is 243134312537. The reversal of 243134312521 is 125213431342.

It can be written as a sum of positive squares in 4 ways, for example, as 39249553225 + 203884759296 = 198115^2 + 451536^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243134312521 - 2²¹ = 243132215369 is a prime.

It is a super-2 number, since 2×243134312521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243134312321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3764940 + ... + 3828973.

It is an arithmetic number, because the mean of its divisors is an integer number (30789524313).

Almost surely, 2^243134312521 is an apocalyptic number.

It is an amenable number.

243134312521 is a deficient number, since it is larger than the sum of its proper divisors (3181881983).

243134312521 is a wasteful number, since it uses less digits than its factorization.

243134312521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7594331.

The product of its digits is 17280, while the sum is 31.

Adding to 243134312521 its reverse (125213431342), we get a palindrome (368347743863).

The spelling of 243134312521 in words is "two hundred forty-three billion, one hundred thirty-four million, three hundred twelve thousand, five hundred twenty-one".