5234181721 has 4 divisors (see below), whose sum is σ = 5242891444. Its totient is φ = 5225472000.

The previous prime is 5234181713. The next prime is 5234181749. The reversal of 5234181721 is 1271814325.

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 2463633225 + 2770548496 = 49635^2 + 52636^2 .

It is a cyclic number.

It is not a de Polignac number, because 5234181721 - 2³ = 5234181713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5234181521) 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, 4353960 + ... + 4355161.

It is an arithmetic number, because the mean of its divisors is an integer number (1310722861).

Almost surely, 2^5234181721 is an apocalyptic number.

It is an amenable number.

5234181721 is a deficient number, since it is larger than the sum of its proper divisors (8709723).

5234181721 is an equidigital number, since it uses as much as digits as its factorization.

5234181721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8709722.

The product of its digits is 13440, while the sum is 34.

The square root of 5234181721 is about 72347.6448891047. The cubic root of 5234181721 is about 1736.2660184740.

The spelling of 5234181721 in words is "five billion, two hundred thirty-four million, one hundred eighty-one thousand, seven hundred twenty-one".