1911 has 12 divisors (see below), whose sum is σ = 3192. Its totient is φ = 1008.

The previous prime is 1907. The next prime is 1913. The reversal of 1911 is 1191.

1911 is nontrivially palindromic in base 2 and base 16.

1911 is an esthetic number in base 3 and base 15, because in such bases its adjacent digits differ by 1.

It is not a de Polignac number, because 1911 - 2² = 1907 is a prime.

1911 is an undulating number in base 4.

1911 is a nontrivial repdigit in base 16.

It is a plaindrome in base 8, base 11, base 12 and base 16.

It is a nialpdrome in base 7, base 13, base 15 and base 16.

It is a zygodrome in base 12 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1913) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141 + ... + 153.

It is an arithmetic number, because the mean of its divisors is an integer number (266).

1911 is a deficient number, since it is larger than the sum of its proper divisors (1281).

1911 is a wasteful number, since it uses less digits than its factorization.

1911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30 (or 23 counting only the distinct ones).

The product of its digits is 9, while the sum is 12.

The square root of 1911 is about 43.7149859888. The cubic root of 1911 is about 12.4094793973.

The spelling of 1911 in words is "one thousand, nine hundred eleven".