131117505 has 16 divisors (see below), whose sum is σ = 210012864. Its totient is φ = 69854400.

The previous prime is 131117501. The next prime is 131117521. The reversal of 131117505 is 505711131.

It is not a de Polignac number, because 131117505 - 2² = 131117501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131117501) 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 15 ways as a sum of consecutive naturals, for example, 11607 + ... + 19923.

It is an arithmetic number, because the mean of its divisors is an integer number (13125804).

Almost surely, 2^131117505 is an apocalyptic number.

131117505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

131117505 is a deficient number, since it is larger than the sum of its proper divisors (78895359).

131117505 is a wasteful number, since it uses less digits than its factorization.

131117505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9376.

The product of its (nonzero) digits is 525, while the sum is 24.

The square root of 131117505 is about 11450.6552214273. The cubic root of 131117505 is about 508.0271145653.

Adding to 131117505 its reverse (505711131), we get a palindrome (636828636).

The spelling of 131117505 in words is "one hundred thirty-one million, one hundred seventeen thousand, five hundred five".