12751209 has 16 divisors (see below), whose sum is σ = 18959040. Its totient is φ = 8470080.

The previous prime is 12751201. The next prime is 12751231. The reversal of 12751209 is 90215721.

It is not a de Polignac number, because 12751209 - 2³ = 12751201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12751201) 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, 8689 + ... + 10049.

It is an arithmetic number, because the mean of its divisors is an integer number (1184940).

Almost surely, 2^12751209 is an apocalyptic number.

It is an amenable number.

12751209 is a deficient number, since it is larger than the sum of its proper divisors (6207831).

12751209 is a wasteful number, since it uses less digits than its factorization.

12751209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717 (or 1711 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 12751209 is about 3570.8835041205. The cubic root of 12751209 is about 233.6238202961.

The spelling of 12751209 in words is "twelve million, seven hundred fifty-one thousand, two hundred nine".