131123221554144 has 96 divisors (see below), whose sum is σ = 346522674788640. Its totient is φ = 43413508454400.

The previous prime is 131123221554107. The next prime is 131123221554163. The reversal of 131123221554144 is 441455122321131.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2171554 + ... + 16338974.

It is an arithmetic number, because the mean of its divisors is an integer number (3609611195715).

Almost surely, 2^{131123221554144} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131123221554144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173261337394320).

131123221554144 is an abundant number, since it is smaller than the sum of its proper divisors (215399453234496).

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

131123221554144 is a wasteful number, since it uses less digits than its factorization.

131123221554144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14168084 (or 14168076 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

Adding to 131123221554144 its reverse (441455122321131), we get a palindrome (572578343875275).

The spelling of 131123221554144 in words is "one hundred thirty-one trillion, one hundred twenty-three billion, two hundred twenty-one million, five hundred fifty-four thousand, one hundred forty-four".