5281721971 has 4 divisors (see below), whose sum is σ = 5296113952. Its totient is φ = 5267329992.

The previous prime is 5281721933. The next prime is 5281721983. The reversal of 5281721971 is 1791271825.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5281721971 - 2¹⁹ = 5281197683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5281721911) 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, 7195440 + ... + 7196173.

It is an arithmetic number, because the mean of its divisors is an integer number (1324028488).

Almost surely, 2^5281721971 is an apocalyptic number.

5281721971 is a deficient number, since it is larger than the sum of its proper divisors (14391981).

5281721971 is a wasteful number, since it uses less digits than its factorization.

5281721971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14391980.

The product of its digits is 70560, while the sum is 43.

The square root of 5281721971 is about 72675.4564553949. The cubic root of 5281721971 is about 1741.5068167950.

The spelling of 5281721971 in words is "five billion, two hundred eighty-one million, seven hundred twenty-one thousand, nine hundred seventy-one".