11639671 has 4 divisors (see below), whose sum is σ = 11779992. Its totient is φ = 11499352.

The previous prime is 11639659. The next prime is 11639681. The reversal of 11639671 is 17693611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17693611 = 13 ⋅1361047.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11639671 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 (11639681) 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, 70036 + ... + 70201.

It is an arithmetic number, because the mean of its divisors is an integer number (2944998).

Almost surely, 2^11639671 is an apocalyptic number.

11639671 is a deficient number, since it is larger than the sum of its proper divisors (140321).

11639671 is an equidigital number, since it uses as much as digits as its factorization.

11639671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140320.

The product of its digits is 6804, while the sum is 34.

The square root of 11639671 is about 3411.6962057018. The cubic root of 11639671 is about 226.6280011421.

The spelling of 11639671 in words is "eleven million, six hundred thirty-nine thousand, six hundred seventy-one".