131231400344 has 32 divisors (see below), whose sum is σ = 270137624400. Its totient is φ = 59270689920.

The previous prime is 131231400343. The next prime is 131231400359. The reversal of 131231400344 is 443004132131.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131231400343) 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, 4735439 + ... + 4763070.

Almost surely, 2^131231400344 is an apocalyptic number.

It is an amenable number.

131231400344 is an abundant number, since it is smaller than the sum of its proper divisors (138906224056).

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

131231400344 is a wasteful number, since it uses less digits than its factorization.

131231400344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9498683 (or 9498679 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 131231400344 its reverse (443004132131), we get a palindrome (574235532475).

The spelling of 131231400344 in words is "one hundred thirty-one billion, two hundred thirty-one million, four hundred thousand, three hundred forty-four".