12209851 has 4 divisors (see below), whose sum is σ = 12299112. Its totient is φ = 12120592.

The previous prime is 12209833. The next prime is 12209861. The reversal of 12209851 is 15890221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12209851 - 2⁵ = 12209819 is a prime.

It is a super-2 number, since 2×12209851² = 298160922884402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12209831) 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, 44425 + ... + 44698.

It is an arithmetic number, because the mean of its divisors is an integer number (3074778).

Almost surely, 2^12209851 is an apocalyptic number.

12209851 is a deficient number, since it is larger than the sum of its proper divisors (89261).

12209851 is an equidigital number, since it uses as much as digits as its factorization.

12209851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89260.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 12209851 is about 3494.2597213144. The cubic root of 12209851 is about 230.2696962351.

The spelling of 12209851 in words is "twelve million, two hundred nine thousand, eight hundred fifty-one".