5211309 has 4 divisors (see below), whose sum is σ = 6948416. Its totient is φ = 3474204.

The previous prime is 5211307. The next prime is 5211347. The reversal of 5211309 is 9031125.

5211309 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 5211309 - 2¹ = 5211307 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

5211309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5211307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 868549 + ... + 868554.

It is an arithmetic number, because the mean of its divisors is an integer number (1737104).

Almost surely, 2^5211309 is an apocalyptic number.

It is an amenable number.

5211309 is a deficient number, since it is larger than the sum of its proper divisors (1737107).

5211309 is a wasteful number, since it uses less digits than its factorization.

5211309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737106.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 5211309 is about 2282.8291657503. The cubic root of 5211309 is about 173.3733236954.

It can be divided in two parts, 521 and 1309, that added together give a triangular number (1830 = T₆₀).

The spelling of 5211309 in words is "five million, two hundred eleven thousand, three hundred nine".