131212311 has 4 divisors (see below), whose sum is σ = 174949752. Its totient is φ = 87474872.

The previous prime is 131212303. The next prime is 131212313. The reversal of 131212311 is 113212131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113212131 = 3 ⋅37737377.

It is a cyclic number.

It is not a de Polignac number, because 131212311 - 2³ = 131212303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131212313) by changing a digit.

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, 21868716 + ... + 21868721.

It is an arithmetic number, because the mean of its divisors is an integer number (43737438).

Almost surely, 2^131212311 is an apocalyptic number.

131212311 is a deficient number, since it is larger than the sum of its proper divisors (43737441).

131212311 is an equidigital number, since it uses as much as digits as its factorization.

131212311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43737440.

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

The square root of 131212311 is about 11454.7942364758. The cubic root of 131212311 is about 508.1495299890.

Adding to 131212311 its reverse (113212131), we get a palindrome (244424442).

The spelling of 131212311 in words is "one hundred thirty-one million, two hundred twelve thousand, three hundred eleven".