5731097821 has 2 divisors, whose sum is σ = 5731097822. Its totient is φ = 5731097820.

The previous prime is 5731097819. The next prime is 5731097857. The reversal of 5731097821 is 1287901375.

5731097821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3199599225 + 2531498596 = 56565^2 + 50314^2 .

It is a cyclic number.

It is not a de Polignac number, because 5731097821 - 2¹ = 5731097819 is a prime.

Together with 5731097819, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5731097221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2865548910 + 2865548911.

It is an arithmetic number, because the mean of its divisors is an integer number (2865548911).

Almost surely, 2^5731097821 is an apocalyptic number.

It is an amenable number.

5731097821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5731097821 is an equidigital number, since it uses as much as digits as its factorization.

5731097821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 5731097821 is about 75704.0145632978. The cubic root of 5731097821 is about 1789.5586670355.

The spelling of 5731097821 in words is "five billion, seven hundred thirty-one million, ninety-seven thousand, eight hundred twenty-one".