131211988 has 24 divisors (see below), whose sum is σ = 236174400. Its totient is φ = 63759168.

The previous prime is 131211973. The next prime is 131211989. The reversal of 131211988 is 889112131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131211989) 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 7 ways as a sum of consecutive naturals, for example, 17881 + ... + 24127.

It is an arithmetic number, because the mean of its divisors is an integer number (9840600).

Almost surely, 2^131211988 is an apocalyptic number.

It is an amenable number.

131211988 is a deficient number, since it is larger than the sum of its proper divisors (104962412).

131211988 is a wasteful number, since it uses less digits than its factorization.

131211988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6399 (or 6397 counting only the distinct ones).

The product of its digits is 3456, while the sum is 34.

The square root of 131211988 is about 11454.7801375670. The cubic root of 131211988 is about 508.1491130249.

The spelling of 131211988 in words is "one hundred thirty-one million, two hundred eleven thousand, nine hundred eighty-eight".