12111901 has 2 divisors, whose sum is σ = 12111902. Its totient is φ = 12111900.

The previous prime is 12111899. The next prime is 12111907. The reversal of 12111901 is 10911121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11909401 + 202500 = 3451^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111901 - 2¹ = 12111899 is a prime.

Together with 12111899, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055950 + 6055951.

It is an arithmetic number, because the mean of its divisors is an integer number (6055951).

Almost surely, 2^12111901 is an apocalyptic number.

It is an amenable number.

12111901 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111901 is an equidigital number, since it uses as much as digits as its factorization.

12111901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 12111901 is about 3480.2156542375. The cubic root of 12111901 is about 229.6522849216.

The spelling of 12111901 in words is "twelve million, one hundred eleven thousand, nine hundred one".