131111212 has 12 divisors (see below), whose sum is σ = 232588216. Its totient is φ = 64657440.

The previous prime is 131111207. The next prime is 131111221. The reversal of 131111212 is 212111131.

131111212 = 1304² + 1305² + ... + 1376².

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131111192 and 131111201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224214 + ... + 224797.

Almost surely, 2^131111212 is an apocalyptic number.

It is an amenable number.

131111212 is a deficient number, since it is larger than the sum of its proper divisors (101477004).

131111212 is a wasteful number, since it uses less digits than its factorization.

131111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449088 (or 449086 counting only the distinct ones).

The product of its digits is 12, while the sum is 13.

The square root of 131111212 is about 11450.3804303613. The cubic root of 131111212 is about 508.0189868283.

Adding to 131111212 its reverse (212111131), we get a palindrome (343222343).

The spelling of 131111212 in words is "one hundred thirty-one million, one hundred eleven thousand, two hundred twelve".