12181019 has 4 divisors (see below), whose sum is σ = 12261840. Its totient is φ = 12100200.

The previous prime is 12180983. The next prime is 12181031. The reversal of 12181019 is 91018121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12181019 is a prime.

It is a super-2 number, since 2×12181019² = 296754447756722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12180985 and 12181003.

It is not an unprimeable number, because it can be changed into a prime (12181079) 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, 40184 + ... + 40485.

It is an arithmetic number, because the mean of its divisors is an integer number (3065460).

Almost surely, 2^12181019 is an apocalyptic number.

12181019 is a deficient number, since it is larger than the sum of its proper divisors (80821).

12181019 is an equidigital number, since it uses as much as digits as its factorization.

12181019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80820.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 12181019 is about 3490.1316594077. The cubic root of 12181019 is about 230.0883025781.

The spelling of 12181019 in words is "twelve million, one hundred eighty-one thousand, nineteen".