11811969 has 12 divisors (see below), whose sum is σ = 18374356. Its totient is φ = 7268832.

The previous prime is 11811953. The next prime is 11811973. The reversal of 11811969 is 96911811.

It can be written as a sum of positive squares in 2 ways, for example, as 5461569 + 6350400 = 2337^2 + 2520^2 .

It is not a de Polignac number, because 11811969 - 2⁴ = 11811953 is a prime.

It is a super-2 number, since 2×11811969² = 279045223313922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11811929) 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, 50362 + ... + 50595.

Almost surely, 2^11811969 is an apocalyptic number.

It is an amenable number.

11811969 is a deficient number, since it is larger than the sum of its proper divisors (6562387).

11811969 is a wasteful number, since it uses less digits than its factorization.

11811969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100976 (or 100973 counting only the distinct ones).

The product of its digits is 3888, while the sum is 36.

The square root of 11811969 is about 3436.8545212156. The cubic root of 11811969 is about 227.7407602919.

The spelling of 11811969 in words is "eleven million, eight hundred eleven thousand, nine hundred sixty-nine".