12197561 has 4 divisors (see below), whose sum is σ = 12204624. Its totient is φ = 12190500.

The previous prime is 12197557. The next prime is 12197593. The reversal of 12197561 is 16579121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12197561 - 2² = 12197557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12197501) 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, 986 + ... + 5036.

It is an arithmetic number, because the mean of its divisors is an integer number (3051156).

Almost surely, 2^12197561 is an apocalyptic number.

It is an amenable number.

12197561 is a deficient number, since it is larger than the sum of its proper divisors (7063).

12197561 is an equidigital number, since it uses as much as digits as its factorization.

12197561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062.

The product of its digits is 3780, while the sum is 32.

The square root of 12197561 is about 3492.5006800286. The cubic root of 12197561 is about 230.1924098803.

It can be divided in two parts, 12 and 197561, that multiplied together give a palindrome (2370732).

The spelling of 12197561 in words is "twelve million, one hundred ninety-seven thousand, five hundred sixty-one".