12197081 has 8 divisors (see below), whose sum is σ = 13588680. Its totient is φ = 10870272.

The previous prime is 12197051. The next prime is 12197083. The reversal of 12197081 is 18079121.

It can be written as a sum of positive squares in 4 ways, for example, as 2059225 + 10137856 = 1435^2 + 3184^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12197081 is a prime.

It is a super-2 number, since 2×12197081² = 297537569841122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12197083) 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, 15800 + ... + 16553.

It is an arithmetic number, because the mean of its divisors is an integer number (1698585).

Almost surely, 2^12197081 is an apocalyptic number.

It is an amenable number.

12197081 is a deficient number, since it is larger than the sum of its proper divisors (1391599).

12197081 is a wasteful number, since it uses less digits than its factorization.

12197081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32395.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 12197081 is about 3492.4319606830. The cubic root of 12197081 is about 230.1893903202.

The spelling of 12197081 in words is "twelve million, one hundred ninety-seven thousand, eighty-one".