131117761 has 4 divisors (see below), whose sum is σ = 131140912. Its totient is φ = 131094612.

The previous prime is 131117743. The next prime is 131117773. The reversal of 131117761 is 167711131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131117761 - 2¹⁷ = 130986689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131117741) 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, 3250 + ... + 16516.

It is an arithmetic number, because the mean of its divisors is an integer number (32785228).

Almost surely, 2^131117761 is an apocalyptic number.

It is an amenable number.

131117761 is a deficient number, since it is larger than the sum of its proper divisors (23151).

131117761 is an equidigital number, since it uses as much as digits as its factorization.

131117761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23150.

The product of its digits is 882, while the sum is 28.

The square root of 131117761 is about 11450.6663998215. Note that the first 3 decimals coincide. The cubic root of 131117761 is about 508.0274451971.

Adding to 131117761 its reverse (167711131), we get a palindrome (298828892).

The spelling of 131117761 in words is "one hundred thirty-one million, one hundred seventeen thousand, seven hundred sixty-one".