131111506 has 8 divisors (see below), whose sum is σ = 200378124. Its totient is φ = 64318800.

The previous prime is 131111503. The next prime is 131111537. The reversal of 131111506 is 605111131.

It can be written as a sum of positive squares in 2 ways, for example, as 111830625 + 19280881 = 10575^2 + 4391^2 .

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

It is not an unprimeable number, because it can be changed into a prime (131111501) 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, 618345 + ... + 618556.

Almost surely, 2^131111506 is an apocalyptic number.

131111506 is a deficient number, since it is larger than the sum of its proper divisors (69266618).

131111506 is a wasteful number, since it uses less digits than its factorization.

131111506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236956.

The product of its (nonzero) digits is 90, while the sum is 19.

The square root of 131111506 is about 11450.3932683555. The cubic root of 131111506 is about 508.0193665504.

Adding to 131111506 its reverse (605111131), we get a palindrome (736222637).

The spelling of 131111506 in words is "one hundred thirty-one million, one hundred eleven thousand, five hundred six".