12261187209 has 8 divisors (see below), whose sum is σ = 16616253952. Its totient is φ = 8040122640.

The previous prime is 12261187199. The next prime is 12261187223. The reversal of 12261187209 is 90278116221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12261187209 - 2⁸ = 12261186953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12261187249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33500329 + ... + 33500694.

It is an arithmetic number, because the mean of its divisors is an integer number (2077031744).

Almost surely, 2^12261187209 is an apocalyptic number.

It is an amenable number.

12261187209 is a deficient number, since it is larger than the sum of its proper divisors (4355066743).

12261187209 is an equidigital number, since it uses as much as digits as its factorization.

12261187209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67001087.

The product of its (nonzero) digits is 24192, while the sum is 39.

The spelling of 12261187209 in words is "twelve billion, two hundred sixty-one million, one hundred eighty-seven thousand, two hundred nine".