131816 has 8 divisors (see below), whose sum is σ = 247170. Its totient is φ = 65904.

The previous prime is 131797. The next prime is 131837. The reversal of 131816 is 618131.

It can be written as a sum of positive squares in only one way, i.e., 119716 + 12100 = 346^2 + 110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8231 + ... + 8246.

2¹³¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

131816 is a deficient number, since it is larger than the sum of its proper divisors (115354).

131816 is a wasteful number, since it uses less digits than its factorization.

131816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16483 (or 16479 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

The square root of 131816 is about 363.0647325202. The cubic root of 131816 is about 50.8927645545.

Adding to 131816 its reverse (618131), we get a palindrome (749947).

The spelling of 131816 in words is "one hundred thirty-one thousand, eight hundred sixteen".