131211111 has 8 divisors (see below), whose sum is σ = 179215344. Its totient is φ = 85340480.

The previous prime is 131211097. The next prime is 131211133. The reversal of 131211111 is 111112131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131211111 - 2¹⁰ = 131210087 is a prime.

131211111 is a modest number, since divided by 11111 gives 1312 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131211181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 533256 + ... + 533501.

It is an arithmetic number, because the mean of its divisors is an integer number (22401918).

Almost surely, 2^131211111 is an apocalyptic number.

131211111 is a deficient number, since it is larger than the sum of its proper divisors (48004233).

131211111 is a wasteful number, since it uses less digits than its factorization.

131211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066801.

The product of its digits is 6, while the sum is 12.

The square root of 131211111 is about 11454.7418565413. The cubic root of 131211111 is about 508.1479808932.

Adding to 131211111 its reverse (111112131), we get a palindrome (242323242).

The spelling of 131211111 in words is "one hundred thirty-one million, two hundred eleven thousand, one hundred eleven".