131216837 has 8 divisors (see below), whose sum is σ = 135117816. Its totient is φ = 127334592.

The previous prime is 131216821. The next prime is 131216857. The reversal of 131216837 is 738612131.

It can be written as a sum of positive squares in 4 ways, for example, as 39325441 + 91891396 = 6271^2 + 9586^2 .

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 131216837 - 2⁴ = 131216821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131216857) 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, 10223 + ... + 19155.

It is an arithmetic number, because the mean of its divisors is an integer number (16889727).

Almost surely, 2^131216837 is an apocalyptic number.

It is an amenable number.

131216837 is a deficient number, since it is larger than the sum of its proper divisors (3900979).

131216837 is an equidigital number, since it uses as much as digits as its factorization.

131216837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9367.

The product of its digits is 6048, while the sum is 32.

The square root of 131216837 is about 11454.9917939735. The cubic root of 131216837 is about 508.1553725767.

Adding to 131216837 its reverse (738612131), we get a palindrome (869828968).

The spelling of 131216837 in words is "one hundred thirty-one million, two hundred sixteen thousand, eight hundred thirty-seven".