12051309 has 16 divisors (see below), whose sum is σ = 16620032. Its totient is φ = 7762608.

The previous prime is 12051293. The next prime is 12051323. The reversal of 12051309 is 90315021.

12051309 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12051309 - 2⁴ = 12051293 is a prime.

It is a super-2 number, since 2×12051309² = 290468097226962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12051329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12834 + ... + 13740.

It is an arithmetic number, because the mean of its divisors is an integer number (1038752).

Almost surely, 2^12051309 is an apocalyptic number.

It is an amenable number.

12051309 is a deficient number, since it is larger than the sum of its proper divisors (4568723).

12051309 is a wasteful number, since it uses less digits than its factorization.

12051309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056.

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

The square root of 12051309 is about 3471.4995319026. The cubic root of 12051309 is about 229.2686853469.

The spelling of 12051309 in words is "twelve million, fifty-one thousand, three hundred nine".