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12112001 = 111101091

12112001 has 4 divisors (see below), whose sum is σ = 13213104. Its totient is φ = 11010900.

The previous prime is 12111997. The next prime is 12112013. The reversal of 12112001 is 10021121.

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: 10021121 = 11911011.

It is a cyclic number.

It is not a de Polignac number, because 12112001 - 22 = 12111997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12112001.

It is not an unprimeable number, because it can be changed into a prime (12112031) 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, 550535 + ... + 550556.

It is an arithmetic number, because the mean of its divisors is an integer number (3303276).

Almost surely, 212112001 is an apocalyptic number.

12112001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12112001 is a deficient number, since it is larger than the sum of its proper divisors (1101103).

12112001 is a wasteful number, since it uses less digits than its factorization.

12112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101102.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 12112001 is about 3480.2300211337. The cubic root of 12112001 is about 229.6529169491.

Adding to 12112001 its reverse (10021121), we get a palindrome (22133122).

The spelling of 12112001 in words is "twelve million, one hundred twelve thousand, one".

Divisors: 1 11 1101091 12112001