5128391 has 2 divisors, whose sum is σ = 5128392. Its totient is φ = 5128390.

The previous prime is 5128369. The next prime is 5128393. The reversal of 5128391 is 1938215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5128391 - 2⁶ = 5128327 is a prime.

It is a Sophie Germain prime.

Together with 5128393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5128393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564195 + 2564196.

It is an arithmetic number, because the mean of its divisors is an integer number (2564196).

Almost surely, 2^5128391 is an apocalyptic number.

5128391 is a deficient number, since it is larger than the sum of its proper divisors (1).

5128391 is an equidigital number, since it uses as much as digits as its factorization.

5128391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The square root of 5128391 is about 2264.5951072984. The cubic root of 5128391 is about 172.4488793418.

The spelling of 5128391 in words is "five million, one hundred twenty-eight thousand, three hundred ninety-one".