131211306 has 32 divisors (see below), whose sum is σ = 294174720. Its totient is φ = 43348032.

The previous prime is 131211281. The next prime is 131211307. The reversal of 131211306 is 603112131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131211307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4650 + ... + 16853.

It is an arithmetic number, because the mean of its divisors is an integer number (9192960).

Almost surely, 2^131211306 is an apocalyptic number.

131211306 is an abundant number, since it is smaller than the sum of its proper divisors (162963414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131211306 is a wasteful number, since it uses less digits than its factorization.

131211306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21627 (or 21621 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 131211306 is about 11454.7503682970. The cubic root of 131211306 is about 508.1482326219.

Adding to 131211306 its reverse (603112131), we get a palindrome (734323437).

The spelling of 131211306 in words is "one hundred thirty-one million, two hundred eleven thousand, three hundred six".