5181391 has 2 divisors, whose sum is σ = 5181392. Its totient is φ = 5181390.

The previous prime is 5181383. The next prime is 5181431. The reversal of 5181391 is 1931815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5181391 - 2³ = 5181383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5181301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2590695 + 2590696.

It is an arithmetic number, because the mean of its divisors is an integer number (2590696).

Almost surely, 2^5181391 is an apocalyptic number.

5181391 is a deficient number, since it is larger than the sum of its proper divisors (1).

5181391 is an equidigital number, since it uses as much as digits as its factorization.

5181391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 28.

The square root of 5181391 is about 2276.2668999922. The cubic root of 5181391 is about 173.0409093894.

The spelling of 5181391 in words is "five million, one hundred eighty-one thousand, three hundred ninety-one".