131212111 has 2 divisors, whose sum is σ = 131212112. Its totient is φ = 131212110.

The previous prime is 131212093. The next prime is 131212183. The reversal of 131212111 is 111212131.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131212111 - 2⁹ = 131211599 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131212091 and 131212100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131210111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65606055 + 65606056.

It is an arithmetic number, because the mean of its divisors is an integer number (65606056).

Almost surely, 2^131212111 is an apocalyptic number.

131212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

131212111 is an equidigital number, since it uses as much as digits as its factorization.

131212111 is an odious number, because the sum of its binary digits is odd.

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

The square root of 131212111 is about 11454.7855065034. The cubic root of 131212111 is about 508.1492718070.

Adding to 131212111 its reverse (111212131), we get a palindrome (242424242).

The spelling of 131212111 in words is "one hundred thirty-one million, two hundred twelve thousand, one hundred eleven".