5181997 has 2 divisors, whose sum is σ = 5181998. Its totient is φ = 5181996.

The previous prime is 5181989. The next prime is 5182027. The reversal of 5181997 is 7991815.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3316041 + 1865956 = 1821^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 5181997 - 2³ = 5181989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5181907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2590998 + 2590999.

It is an arithmetic number, because the mean of its divisors is an integer number (2590999).

Almost surely, 2^5181997 is an apocalyptic number.

It is an amenable number.

5181997 is a deficient number, since it is larger than the sum of its proper divisors (1).

5181997 is an equidigital number, since it uses as much as digits as its factorization.

5181997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 40.

The square root of 5181997 is about 2276.4000087858. The cubic root of 5181997 is about 173.0476552422.

The spelling of 5181997 in words is "five million, one hundred eighty-one thousand, nine hundred ninety-seven".