131117605 has 4 divisors (see below), whose sum is σ = 157341132. Its totient is φ = 104894080.

The previous prime is 131117573. The next prime is 131117627. The reversal of 131117605 is 506711131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 80892036 + 50225569 = 8994^2 + 7087^2 .

It is not a de Polignac number, because 131117605 - 2⁵ = 131117573 is a prime.

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 131117605.

It is a congruent number.

It is an unprimeable number.

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, 13111756 + ... + 13111765.

It is an arithmetic number, because the mean of its divisors is an integer number (39335283).

Almost surely, 2^131117605 is an apocalyptic number.

It is an amenable number.

131117605 is a deficient number, since it is larger than the sum of its proper divisors (26223527).

131117605 is an equidigital number, since it uses as much as digits as its factorization.

131117605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26223526.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 131117605 is about 11450.6595879888. The cubic root of 131117605 is about 508.0272437184.

Adding to 131117605 its reverse (506711131), we get a palindrome (637828736).

The spelling of 131117605 in words is "one hundred thirty-one million, one hundred seventeen thousand, six hundred five".