5211391 has 2 divisors, whose sum is σ = 5211392. Its totient is φ = 5211390.

The previous prime is 5211389. The next prime is 5211421. The reversal of 5211391 is 1931125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5211391 - 2¹ = 5211389 is a prime.

Together with 5211389, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5211091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2605695 + 2605696.

It is an arithmetic number, because the mean of its divisors is an integer number (2605696).

Almost surely, 2^5211391 is an apocalyptic number.

5211391 is a deficient number, since it is larger than the sum of its proper divisors (1).

5211391 is an equidigital number, since it uses as much as digits as its factorization.

5211391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270, while the sum is 22.

The square root of 5211391 is about 2282.8471258496. The cubic root of 5211391 is about 173.3742330343.

The spelling of 5211391 in words is "five million, two hundred eleven thousand, three hundred ninety-one".