5191861 has 2 divisors, whose sum is σ = 5191862. Its totient is φ = 5191860.

The previous prime is 5191853. The next prime is 5191867. The reversal of 5191861 is 1681915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4813636 + 378225 = 2194^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 5191861 - 2³ = 5191853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5191867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2595930 + 2595931.

It is an arithmetic number, because the mean of its divisors is an integer number (2595931).

Almost surely, 2^5191861 is an apocalyptic number.

It is an amenable number.

5191861 is a deficient number, since it is larger than the sum of its proper divisors (1).

5191861 is an equidigital number, since it uses as much as digits as its factorization.

5191861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 31.

The square root of 5191861 is about 2278.5655575383. The cubic root of 5191861 is about 173.1573851496.

The spelling of 5191861 in words is "five million, one hundred ninety-one thousand, eight hundred sixty-one".