131220715520 has 96 divisors (see below), whose sum is σ = 315972362160. Its totient is φ = 52301660160.

The previous prime is 131220715513. The next prime is 131220715547. The reversal of 131220715520 is 25517022131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2875280 + ... + 2920560.

Almost surely, 2^131220715520 is an apocalyptic number.

131220715520 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 131220715520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157986181080).

131220715520 is an abundant number, since it is smaller than the sum of its proper divisors (184751646640).

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

131220715520 is an equidigital number, since it uses as much as digits as its factorization.

131220715520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45591 (or 45571 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 131220715520 its reverse (25517022131), we get a palindrome (156737737651).

The spelling of 131220715520 in words is "one hundred thirty-one billion, two hundred twenty million, seven hundred fifteen thousand, five hundred twenty".