11911001 has 4 divisors (see below), whose sum is σ = 11919012. Its totient is φ = 11902992.

The previous prime is 11910973. The next prime is 11911013. The reversal of 11911001 is 10011911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2449225 + 9461776 = 1565^2 + 3076^2 .

It is a cyclic number.

It is not a de Polignac number, because 11911001 - 2⁶ = 11910937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11911201) 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, 1046 + ... + 4991.

It is an arithmetic number, because the mean of its divisors is an integer number (2979753).

Almost surely, 2^11911001 is an apocalyptic number.

It is an amenable number.

11911001 is a deficient number, since it is larger than the sum of its proper divisors (8011).

11911001 is an equidigital number, since it uses as much as digits as its factorization.

11911001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8010.

The product of its (nonzero) digits is 9, while the sum is 14.

The square root of 11911001 is about 3451.2318090792. The cubic root of 11911001 is about 228.3754522381.

Adding to 11911001 its reverse (10011911), we get a palindrome (21922912).

The spelling of 11911001 in words is "eleven million, nine hundred eleven thousand, one".