11961909 has 12 divisors (see below), whose sum is σ = 18029856. Its totient is φ = 7627752.

The previous prime is 11961899. The next prime is 11961967. The reversal of 11961909 is 90916911.

11961909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-11961909 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11960909) 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, 28687 + ... + 29100.

It is an arithmetic number, because the mean of its divisors is an integer number (1502488).

Almost surely, 2^11961909 is an apocalyptic number.

It is an amenable number.

11961909 is a deficient number, since it is larger than the sum of its proper divisors (6067947).

11961909 is a wasteful number, since it uses less digits than its factorization.

11961909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57816 (or 57813 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 11961909 is about 3458.5992829468. The cubic root of 11961909 is about 228.7003511347.

The spelling of 11961909 in words is "eleven million, nine hundred sixty-one thousand, nine hundred nine".