11871631 has 4 divisors (see below), whose sum is σ = 11882632. Its totient is φ = 11860632.

The previous prime is 11871619. The next prime is 11871647. The reversal of 11871631 is 13617811.

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 11871631 - 2¹⁷ = 11740559 is a prime.

It is a super-2 number, since 2×11871631² = 281871245200322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11871631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11871731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3681 + ... + 6106.

It is an arithmetic number, because the mean of its divisors is an integer number (2970658).

Almost surely, 2^11871631 is an apocalyptic number.

11871631 is a deficient number, since it is larger than the sum of its proper divisors (11001).

11871631 is an equidigital number, since it uses as much as digits as its factorization.

11871631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000.

The product of its digits is 1008, while the sum is 28.

The square root of 11871631 is about 3445.5233274497. The cubic root of 11871631 is about 228.1235544038.

The spelling of 11871631 in words is "eleven million, eight hundred seventy-one thousand, six hundred thirty-one".