11917071 has 32 divisors (see below), whose sum is σ = 18483200. Its totient is φ = 7581600.

The previous prime is 11917067. The next prime is 11917097. The reversal of 11917071 is 17071911.

It is not a de Polignac number, because 11917071 - 2² = 11917067 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11917001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78846 + ... + 78996.

It is an arithmetic number, because the mean of its divisors is an integer number (577600).

Almost surely, 2^11917071 is an apocalyptic number.

11917071 is a deficient number, since it is larger than the sum of its proper divisors (6566129).

11917071 is a wasteful number, since it uses less digits than its factorization.

11917071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 441, while the sum is 27.

The square root of 11917071 is about 3452.1110932298. Note that the first 3 decimals coincide. The cubic root of 11917071 is about 228.4142400103.

Adding to 11917071 its reverse (17071911), we get a palindrome (28988982).

The spelling of 11917071 in words is "eleven million, nine hundred seventeen thousand, seventy-one".