131225222520 has 192 divisors, whose sum is σ = 488792041920. Its totient is φ = 29909164032.

The previous prime is 131225222501. The next prime is 131225222533. The reversal of 131225222520 is 25222522131.

131225222520 is a `hidden beast` number, since 13 + 122 + 5 + 2 + 2 + 2 + 520 = 666.

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, 815802 + ... + 963318.

It is an arithmetic number, because the mean of its divisors is an integer number (2545791885).

Almost surely, 2^131225222520 is an apocalyptic number.

131225222520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131225222520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244396020960).

131225222520 is an abundant number, since it is smaller than the sum of its proper divisors (357566819400).

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

131225222520 is a wasteful number, since it uses less digits than its factorization.

131225222520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147894 (or 147887 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 131225222520 its reverse (25222522131), we get a palindrome (156447744651).

The spelling of 131225222520 in words is "one hundred thirty-one billion, two hundred twenty-five million, two hundred twenty-two thousand, five hundred twenty".