131121304513550 has 96 divisors (see below), whose sum is σ = 268263548784000. Its totient is φ = 47378763048960.

The previous prime is 131121304513523. The next prime is 131121304513627. The reversal of 131121304513550 is 55315403121131.

It is a self number, because there is not a number n which added to its sum of digits gives 131121304513550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 285382406 + ... + 285841494.

It is an arithmetic number, because the mean of its divisors is an integer number (2794411966500).

Almost surely, 2^{131121304513550} is an apocalyptic number.

131121304513550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131121304513550 is an abundant number, since it is smaller than the sum of its proper divisors (137142244270450).

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

131121304513550 is a wasteful number, since it uses less digits than its factorization.

131121304513550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468510 (or 468505 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

Adding to 131121304513550 its reverse (55315403121131), we get a palindrome (186436707634681).

The spelling of 131121304513550 in words is "one hundred thirty-one trillion, one hundred twenty-one billion, three hundred four million, five hundred thirteen thousand, five hundred fifty".