12181619 has 2 divisors, whose sum is σ = 12181620. Its totient is φ = 12181618.

The previous prime is 12181613. The next prime is 12181627. The reversal of 12181619 is 91618121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12181619 - 2¹² = 12177523 is a prime.

It is a super-2 number, since 2×12181619² = 296783682922322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12181591 and 12181600.

It is not a weakly prime, because it can be changed into another prime (12181613) 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 as a sum of consecutive naturals, namely, 6090809 + 6090810.

It is an arithmetic number, because the mean of its divisors is an integer number (6090810).

Almost surely, 2^12181619 is an apocalyptic number.

12181619 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181619 is an equidigital number, since it uses as much as digits as its factorization.

12181619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 29.

The square root of 12181619 is about 3490.2176149919. The cubic root of 12181619 is about 230.0920803331.

The spelling of 12181619 in words is "twelve million, one hundred eighty-one thousand, six hundred nineteen".