11171971 has 4 divisors (see below), whose sum is σ = 11270952. Its totient is φ = 11072992.

The previous prime is 11171969. The next prime is 11171987. The reversal of 11171971 is 17917111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17917111 = 43 ⋅416677.

It is a cyclic number.

It is not a de Polignac number, because 11171971 - 2¹ = 11171969 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (11171911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49321 + ... + 49546.

It is an arithmetic number, because the mean of its divisors is an integer number (2817738).

Almost surely, 2^11171971 is an apocalyptic number.

11171971 is a deficient number, since it is larger than the sum of its proper divisors (98981).

11171971 is an equidigital number, since it uses as much as digits as its factorization.

11171971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98980.

The product of its digits is 441, while the sum is 28.

The square root of 11171971 is about 3342.4498500352. The cubic root of 11171971 is about 223.5509912399.

The spelling of 11171971 in words is "eleven million, one hundred seventy-one thousand, nine hundred seventy-one".