12011919 has 4 divisors (see below), whose sum is σ = 16015896. Its totient is φ = 8007944.

The previous prime is 12011917. The next prime is 12011929. The reversal of 12011919 is 91911021.

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

It is a cyclic number.

It is not a de Polignac number, because 12011919 - 2¹ = 12011917 is a prime.

It is a super-2 number, since 2×12011919² = 288572396125122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011917) 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, 2001984 + ... + 2001989.

It is an arithmetic number, because the mean of its divisors is an integer number (4003974).

Almost surely, 2^12011919 is an apocalyptic number.

12011919 is a deficient number, since it is larger than the sum of its proper divisors (4003977).

12011919 is an equidigital number, since it uses as much as digits as its factorization.

12011919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003976.

The product of its (nonzero) digits is 162, while the sum is 24.

The square root of 12011919 is about 3465.8215476276. The cubic root of 12011919 is about 229.0186225901.

The spelling of 12011919 in words is "twelve million, eleven thousand, nine hundred nineteen".