131511313 has 8 divisors (see below), whose sum is σ = 135504936. Its totient is φ = 127555200.

The previous prime is 131511307. The next prime is 131511323. The reversal of 131511313 is 313115131.

It can be written as a sum of positive squares in 4 ways, for example, as 14265729 + 117245584 = 3777^2 + 10828^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 131511313 - 2⁹ = 131510801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131511323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2178 + ... + 16363.

It is an arithmetic number, because the mean of its divisors is an integer number (16938117).

Almost surely, 2^131511313 is an apocalyptic number.

It is an amenable number.

131511313 is a deficient number, since it is larger than the sum of its proper divisors (3993623).

131511313 is a wasteful number, since it uses less digits than its factorization.

131511313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18755.

The product of its digits is 135, while the sum is 19.

The square root of 131511313 is about 11467.8382008119. The cubic root of 131511313 is about 508.5352215966.

Adding to 131511313 its reverse (313115131), we get a palindrome (444626444).

The spelling of 131511313 in words is "one hundred thirty-one million, five hundred eleven thousand, three hundred thirteen".