11816971 has 4 divisors (see below), whose sum is σ = 11824272. Its totient is φ = 11809672.

The previous prime is 11816951. The next prime is 11816977. The reversal of 11816971 is 17961811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11816971 - 2⁷ = 11816843 is a prime.

It is a super-2 number, since 2×11816971² = 279281607229682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11816977) 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, 16 + ... + 4861.

It is an arithmetic number, because the mean of its divisors is an integer number (2956068).

Almost surely, 2^11816971 is an apocalyptic number.

11816971 is a deficient number, since it is larger than the sum of its proper divisors (7301).

11816971 is an equidigital number, since it uses as much as digits as its factorization.

11816971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7300.

The product of its digits is 3024, while the sum is 34.

The square root of 11816971 is about 3437.5821444731. The cubic root of 11816971 is about 227.7729027886.

The spelling of 11816971 in words is "eleven million, eight hundred sixteen thousand, nine hundred seventy-one".