11681971 has 8 divisors (see below), whose sum is σ = 13534304. Its totient is φ = 9875520.

The previous prime is 11681959. The next prime is 11681981. The reversal of 11681971 is 17918611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11681971 - 2⁹ = 11681459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11681911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10920 + ... + 11941.

It is an arithmetic number, because the mean of its divisors is an integer number (1691788).

Almost surely, 2^11681971 is an apocalyptic number.

11681971 is a deficient number, since it is larger than the sum of its proper divisors (1852333).

11681971 is an equidigital number, since it uses as much as digits as its factorization.

11681971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22941.

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

The square root of 11681971 is about 3417.8898460893. The cubic root of 11681971 is about 226.9022006208.

The spelling of 11681971 in words is "eleven million, six hundred eighty-one thousand, nine hundred seventy-one".