131311212 has 24 divisors (see below), whose sum is σ = 308633136. Its totient is φ = 43450368.

The previous prime is 131311199. The next prime is 131311241. The reversal of 131311212 is 212113131.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 131311191 and 131311200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38293 + ... + 41580.

It is an arithmetic number, because the mean of its divisors is an integer number (12859714).

Almost surely, 2^131311212 is an apocalyptic number.

131311212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

131311212 is an abundant number, since it is smaller than the sum of its proper divisors (177321924).

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

131311212 is a wasteful number, since it uses less digits than its factorization.

131311212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80017 (or 80015 counting only the distinct ones).

The product of its digits is 36, while the sum is 15.

The square root of 131311212 is about 11459.1104366788. The cubic root of 131311212 is about 508.2771701335.

Adding to 131311212 its reverse (212113131), we get a palindrome (343424343).

The spelling of 131311212 in words is "one hundred thirty-one million, three hundred eleven thousand, two hundred twelve".