11955911 has 4 divisors (see below), whose sum is σ = 13042824. Its totient is φ = 10869000.

The previous prime is 11955877. The next prime is 11955941.

11955911 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11955911 - 2¹⁴ = 11939527 is a prime.

It is a super-3 number, since 3×11955911³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11955941) 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, 543440 + ... + 543461.

It is an arithmetic number, because the mean of its divisors is an integer number (3260706).

Almost surely, 2^11955911 is an apocalyptic number.

11955911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11955911 is a deficient number, since it is larger than the sum of its proper divisors (1086913).

11955911 is a wasteful number, since it uses less digits than its factorization.

11955911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086912.

The product of its digits is 2025, while the sum is 32.

The square root of 11955911 is about 3457.7320601805. The cubic root of 11955911 is about 228.6621193874.

The spelling of 11955911 in words is "eleven million, nine hundred fifty-five thousand, nine hundred eleven".