131212333 has 4 divisors (see below), whose sum is σ = 149956960. Its totient is φ = 112467708.

The previous prime is 131212321. The next prime is 131212343. The reversal of 131212333 is 333212131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131212333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131212333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131212303) 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, 9372303 + ... + 9372316.

It is an arithmetic number, because the mean of its divisors is an integer number (37489240).

Almost surely, 2^131212333 is an apocalyptic number.

It is an amenable number.

131212333 is a deficient number, since it is larger than the sum of its proper divisors (18744627).

131212333 is an equidigital number, since it uses as much as digits as its factorization.

131212333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18744626.

The product of its digits is 324, while the sum is 19.

The square root of 131212333 is about 11454.7951967724. The cubic root of 131212333 is about 508.1495583890.

Adding to 131212333 its reverse (333212131), we get a palindrome (464424464).

The spelling of 131212333 in words is "one hundred thirty-one million, two hundred twelve thousand, three hundred thirty-three".