131081216 has 44 divisors (see below), whose sum is σ = 299484288. Its totient is φ = 56174592.

The previous prime is 131081207. The next prime is 131081219. The reversal of 131081216 is 612180131.

It is a junction number, because it is equal to n+sod(n) for n = 131081191 and 131081200.

It is not an unprimeable number, because it can be changed into a prime (131081219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1976 + ... + 16311.

Almost surely, 2^131081216 is an apocalyptic number.

131081216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

131081216 is an abundant number, since it is smaller than the sum of its proper divisors (168403072).

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

131081216 is an equidigital number, since it uses as much as digits as its factorization.

131081216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18314 (or 18296 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 131081216 is about 11449.0705299601. The cubic root of 131081216 is about 507.9802418587.

The spelling of 131081216 in words is "one hundred thirty-one million, eighty-one thousand, two hundred sixteen".