11871031 has 4 divisors (see below), whose sum is σ = 11916432. Its totient is φ = 11825632.

The previous prime is 11871019. The next prime is 11871061. The reversal of 11871031 is 13017811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11871031 - 2¹³ = 11862839 is a prime.

It is a super-2 number, since 2×11871031² = 281842754005922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11870993 and 11871011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11871061) 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, 22306 + ... + 22831.

It is an arithmetic number, because the mean of its divisors is an integer number (2979108).

Almost surely, 2^11871031 is an apocalyptic number.

11871031 is a deficient number, since it is larger than the sum of its proper divisors (45401).

11871031 is an equidigital number, since it uses as much as digits as its factorization.

11871031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45400.

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 11871031 is about 3445.4362568476. The cubic root of 11871031 is about 228.1197111678.

Adding to 11871031 its reverse (13017811), we get a palindrome (24888842).

The spelling of 11871031 in words is "eleven million, eight hundred seventy-one thousand, thirty-one".