11931871 has 16 divisors (see below), whose sum is σ = 14621184. Its totient is φ = 9513504.

The previous prime is 11931851. The next prime is 11931877. The reversal of 11931871 is 17813911.

It is not a de Polignac number, because 11931871 - 2⁷ = 11931743 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 (11931877) 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 15 ways as a sum of consecutive naturals, for example, 4956 + ... + 6958.

It is an arithmetic number, because the mean of its divisors is an integer number (913824).

Almost surely, 2^11931871 is an apocalyptic number.

11931871 is a deficient number, since it is larger than the sum of its proper divisors (2689313).

11931871 is a wasteful number, since it uses less digits than its factorization.

11931871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070.

The product of its digits is 1512, while the sum is 31.

The square root of 11931871 is about 3454.2540439290. The cubic root of 11931871 is about 228.5087579857.

The spelling of 11931871 in words is "eleven million, nine hundred thirty-one thousand, eight hundred seventy-one".