131521520 has 160 divisors (see below), whose sum is σ = 358852032. Its totient is φ = 44384256.

The previous prime is 131521501. The next prime is 131521531. The reversal of 131521520 is 25125131.

It is a happy number.

It is a super-2 number, since 2×131521520² = 34595820446220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 131521492 and 131521501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 760154 + ... + 760326.

Almost surely, 2^131521520 is an apocalyptic number.

131521520 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 131521520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179426016).

131521520 is an abundant number, since it is smaller than the sum of its proper divisors (227330512).

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

131521520 is a wasteful number, since it uses less digits than its factorization.

131521520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 131521520 is about 11468.2832193838. The cubic root of 131521520 is about 508.5483775871.

Adding to 131521520 its reverse (25125131), we get a palindrome (156646651).

The spelling of 131521520 in words is "one hundred thirty-one million, five hundred twenty-one thousand, five hundred twenty".