11971155 has 32 divisors (see below), whose sum is σ = 22846464. Its totient is φ = 5233536.

The previous prime is 11971117. The next prime is 11971199. The reversal of 11971155 is 55117911.

It is not a de Polignac number, because 11971155 - 2⁹ = 11970643 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 64 + ... + 4893.

It is an arithmetic number, because the mean of its divisors is an integer number (713952).

Almost surely, 2^11971155 is an apocalyptic number.

11971155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11971155 is a deficient number, since it is larger than the sum of its proper divisors (10875309).

11971155 is a wasteful number, since it uses less digits than its factorization.

11971155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995.

The product of its digits is 1575, while the sum is 30.

The square root of 11971155 is about 3459.9356930440. The cubic root of 11971155 is about 228.7592608750.

The spelling of 11971155 in words is "eleven million, nine hundred seventy-one thousand, one hundred fifty-five".