131511005 has 4 divisors (see below), whose sum is σ = 157813212. Its totient is φ = 105208800.

The previous prime is 131511001. The next prime is 131511043. The reversal of 131511005 is 500115131.

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 83375161 + 48135844 = 9131^2 + 6938^2 .

It is not a de Polignac number, because 131511005 - 2² = 131511001 is a prime.

It is a super-2 number, since 2×131511005² = 34590288872220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131511001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13151096 + ... + 13151105.

It is an arithmetic number, because the mean of its divisors is an integer number (39453303).

Almost surely, 2^131511005 is an apocalyptic number.

It is an amenable number.

131511005 is a deficient number, since it is larger than the sum of its proper divisors (26302207).

131511005 is an equidigital number, since it uses as much as digits as its factorization.

131511005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26302206.

The product of its (nonzero) digits is 75, while the sum is 17.

The square root of 131511005 is about 11467.8247719435. The cubic root of 131511005 is about 508.5348245992.

Adding to 131511005 its reverse (500115131), we get a palindrome (631626136).

The spelling of 131511005 in words is "one hundred thirty-one million, five hundred eleven thousand, five".