12189481 has 4 divisors (see below), whose sum is σ = 12206464. Its totient is φ = 12172500.

The previous prime is 12189473. The next prime is 12189491. The reversal of 12189481 is 18498121.

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 an emirpimes, since its reverse is a distinct semiprime: 18498121 = 3967 ⋅4663.

It is a cyclic number.

It is not a de Polignac number, because 12189481 - 2³ = 12189473 is a prime.

It is a super-2 number, since 2×12189481² = 297166894098722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12189461) 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, 7365 + ... + 8866.

It is an arithmetic number, because the mean of its divisors is an integer number (3051616).

Almost surely, 2^12189481 is an apocalyptic number.

It is an amenable number.

12189481 is a deficient number, since it is larger than the sum of its proper divisors (16983).

12189481 is an equidigital number, since it uses as much as digits as its factorization.

12189481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16982.

The product of its digits is 4608, while the sum is 34.

The square root of 12189481 is about 3491.3437241269. The cubic root of 12189481 is about 230.1415700575.

The spelling of 12189481 in words is "twelve million, one hundred eighty-nine thousand, four hundred eighty-one".