5243551321 has 4 divisors (see below), whose sum is σ = 5243753700. Its totient is φ = 5243348944.

The previous prime is 5243551307. The next prime is 5243551333. The reversal of 5243551321 is 1231553425.

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 549246096 + 4694305225 = 23436^2 + 68515^2 .

It is a cyclic number.

It is not a de Polignac number, because 5243551321 - 2²⁹ = 4706680409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5243551301) 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, 55426 + ... + 116443.

It is an arithmetic number, because the mean of its divisors is an integer number (1310938425).

Almost surely, 2^5243551321 is an apocalyptic number.

It is an amenable number.

5243551321 is a deficient number, since it is larger than the sum of its proper divisors (202379).

5243551321 is a wasteful number, since it uses less digits than its factorization.

5243551321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202378.

The product of its digits is 18000, while the sum is 31.

The square root of 5243551321 is about 72412.3699446441. The cubic root of 5243551321 is about 1737.3014188174.

The spelling of 5243551321 in words is "five billion, two hundred forty-three million, five hundred fifty-one thousand, three hundred twenty-one".