131212444 has 24 divisors (see below), whose sum is σ = 250815600. Its totient is φ = 59566080.

The previous prime is 131212439. The next prime is 131212451. The reversal of 131212444 is 444212131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 47452 + ... + 50140.

It is an arithmetic number, because the mean of its divisors is an integer number (10450650).

Almost surely, 2^131212444 is an apocalyptic number.

It is an amenable number.

131212444 is a deficient number, since it is larger than the sum of its proper divisors (119603156).

131212444 is a wasteful number, since it uses less digits than its factorization.

131212444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3813 (or 3811 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 131212444 is about 11454.8000419038. The cubic root of 131212444 is about 508.1497016798.

Adding to 131212444 its reverse (444212131), we get a palindrome (575424575).

The spelling of 131212444 in words is "one hundred thirty-one million, two hundred twelve thousand, four hundred forty-four".