12206991 has 8 divisors (see below), whose sum is σ = 16384384. Its totient is φ = 8083800.

The previous prime is 12206989. The next prime is 12206993. The reversal of 12206991 is 19960221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12206989) and next prime (12206993).

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

It is not a de Polignac number, because 12206991 - 2¹ = 12206989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12206993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13021 + ... + 13926.

It is an arithmetic number, because the mean of its divisors is an integer number (2048048).

Almost surely, 2^12206991 is an apocalyptic number.

12206991 is a deficient number, since it is larger than the sum of its proper divisors (4177393).

12206991 is a wasteful number, since it uses less digits than its factorization.

12206991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27101.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 12206991 is about 3493.8504547276. The cubic root of 12206991 is about 230.2517155963.

The spelling of 12206991 in words is "twelve million, two hundred six thousand, nine hundred ninety-one".