5191309 has 4 divisors (see below), whose sum is σ = 5226300. Its totient is φ = 5156320.

The previous prime is 5191301. The next prime is 5191331. The reversal of 5191309 is 9031915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9031915 = 5 ⋅1806383.

It can be written as a sum of positive squares in 2 ways, for example, as 675684 + 4515625 = 822^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 5191309 - 2³ = 5191301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5191301) 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, 17272 + ... + 17569.

It is an arithmetic number, because the mean of its divisors is an integer number (1306575).

Almost surely, 2^5191309 is an apocalyptic number.

It is an amenable number.

5191309 is a deficient number, since it is larger than the sum of its proper divisors (34991).

5191309 is a wasteful number, since it uses less digits than its factorization.

5191309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34990.

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

The square root of 5191309 is about 2278.4444254798. Note that the first 4 decimals coincide. The cubic root of 5191309 is about 173.1512482195.

Subtracting 5191309 from its reverse (9031915), we obtain a triangular number (3840606 = T₂₇₇₁).

The spelling of 5191309 in words is "five million, one hundred ninety-one thousand, three hundred nine".