5091391 has 4 divisors (see below), whose sum is σ = 5105632. Its totient is φ = 5077152.

The previous prime is 5091379. The next prime is 5091407. The reversal of 5091391 is 1931905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1931905 = 5 ⋅386381.

It is a cyclic number.

It is not a de Polignac number, because 5091391 - 2¹⁵ = 5058623 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5091301) 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 in 3 ways as a sum of consecutive naturals, for example, 6570 + ... + 7303.

It is an arithmetic number, because the mean of its divisors is an integer number (1276408).

Almost surely, 2^5091391 is an apocalyptic number.

5091391 is a deficient number, since it is larger than the sum of its proper divisors (14241).

5091391 is a wasteful number, since it uses less digits than its factorization.

5091391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14240.

The product of its (nonzero) digits is 1215, while the sum is 28.

The square root of 5091391 is about 2256.4110884322. The cubic root of 5091391 is about 172.0331534253.

The spelling of 5091391 in words is "five million, ninety-one thousand, three hundred ninety-one".