131211216 has 60 divisors (see below), whose sum is σ = 375041472. Its totient is φ = 42804288.

The previous prime is 131211181. The next prime is 131211229. The reversal of 131211216 is 612112131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2926 + ... + 16461.

Almost surely, 2^131211216 is an apocalyptic number.

131211216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

131211216 is an abundant number, since it is smaller than the sum of its proper divisors (243830256).

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

131211216 is a wasteful number, since it uses less digits than its factorization.

131211216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19448 (or 19439 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 131211216 is about 11454.7464397952. The cubic root of 131211216 is about 508.1481164395.

Adding to 131211216 its reverse (612112131), we get a palindrome (743323347).

The spelling of 131211216 in words is "one hundred thirty-one million, two hundred eleven thousand, two hundred sixteen".