5081865421 has 2 divisors, whose sum is σ = 5081865422. Its totient is φ = 5081865420.

The previous prime is 5081865407. The next prime is 5081865427. The reversal of 5081865421 is 1245681805.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4457565225 + 624300196 = 66765^2 + 24986^2 .

It is a cyclic number.

It is not a de Polignac number, because 5081865421 - 2⁵ = 5081865389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5081865427) 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, 2540932710 + 2540932711.

It is an arithmetic number, because the mean of its divisors is an integer number (2540932711).

Almost surely, 2^5081865421 is an apocalyptic number.

It is an amenable number.

5081865421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5081865421 is an equidigital number, since it uses as much as digits as its factorization.

5081865421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 5081865421 is about 71287.2037675767. The cubic root of 5081865421 is about 1719.2579976203.

The spelling of 5081865421 in words is "five billion, eighty-one million, eight hundred sixty-five thousand, four hundred twenty-one".