11961911 has 4 divisors (see below), whose sum is σ = 12882072. Its totient is φ = 11041752.

The previous prime is 11961899. The next prime is 11961967. The reversal of 11961911 is 11916911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11916911 = 107 ⋅111373.

It is a cyclic number.

It is not a de Polignac number, because 11961911 - 2⁶ = 11961847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460061 + ... + 460086.

It is an arithmetic number, because the mean of its divisors is an integer number (3220518).

Almost surely, 2^11961911 is an apocalyptic number.

11961911 is a deficient number, since it is larger than the sum of its proper divisors (920161).

11961911 is an equidigital number, since it uses as much as digits as its factorization.

11961911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920160.

The product of its digits is 486, while the sum is 29.

The square root of 11961911 is about 3458.5995720812. The cubic root of 11961911 is about 228.7003638807.

The spelling of 11961911 in words is "eleven million, nine hundred sixty-one thousand, nine hundred eleven".