131543316 has 18 divisors (see below), whose sum is σ = 332512362. Its totient is φ = 43847760.

The previous prime is 131543303. The next prime is 131543317. The reversal of 131543316 is 613345131.

It can be written as a sum of positive squares in only one way, i.e., 112148100 + 19395216 = 10590^2 + 4404^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 131543316.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131543317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1826955 + ... + 1827026.

It is an arithmetic number, because the mean of its divisors is an integer number (18472909).

Almost surely, 2^131543316 is an apocalyptic number.

It is an amenable number.

131543316 is an abundant number, since it is smaller than the sum of its proper divisors (200969046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131543316 is a wasteful number, since it uses less digits than its factorization.

131543316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653991 (or 3653986 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 131543316 is about 11469.2334530255. The cubic root of 131543316 is about 508.5764685747.

Adding to 131543316 its reverse (613345131), we get a palindrome (744888447).

The spelling of 131543316 in words is "one hundred thirty-one million, five hundred forty-three thousand, three hundred sixteen".